全国英语等级考试（四级）
单选题Incomplete proteins ______.A have all the essential amino acidsB are manufactured by the bodyC can mix with other proteins to form complete proteinsD can be gained from meat, fish, eggs, and milk
题目
have all the essential amino acids
are manufactured by the body
can mix with other proteins to form complete proteins
can be gained from meat, fish, eggs, and milk
相似问题和答案
第1题：
A、would have enjoyed
B、shouldn't have enjoyed
C、needn't have enjoyed
D、can’t have enjoyed
第2题：
We get energy from the foods we eat.Our food supplies energy to keep our organs working.Our food also supplies heat to warm our bodies.
The main energy foods are the carbohydrates (碳水化合物).These are the sugars and starches(淀粉). Wheat and rice are rich in starch and many fruits and vegetables contain considerable amount of sugar. Sweets, honey and jam are also rich in sugar.
Like carbohydrates, fats are food that provides us with energy. Butter, margarine, certain types of fish, eggs, cooking oils and most red meats are rich in fats. Fats can be stored in various parts of the body as reserves of energy. Because fats in general are slowly digested, they satisfy hunger for long periods.
Proteins (蛋白质) are very complex substances. The body needs proteins for the growth of new cells and for the repair and replacement of old cells. Foods rich in proteins are essential to a balanced diet. Milk, some vegetables, meat, chicken, fish, cheese, grains and nuts are some foods rich in proteins.
A good diet will contain a variety of foods so that the body contains all the minerals it needs for good health.
Vitamins are necessary for the proper working of the body. If we eat a variety of foods, we can be sure of obtaining all the vitamins we need.
Water makes up about 70 per cent of the weight of the human body. The average adult needs about two liters of water daily to replace the water the body loses.
1.Of the following substances, which are not used as sources of energy by living things?()
A. Starches
B. Vitamins
C. Proteins
D. Fats
2.If equal weight of the following substances is “burned” in the body,
A. carbohydrates
B. fats
C. vitamins
D. mineral salts
3.A boy grows five centimeters a year.The new material
A. fats
B. vitamins
C. proteins
D.carbohydrates
4.Which of the following is not true?()
A. If a man weighs 150 pounds, 105 pounds are water.
B. Apple, butter and meat are rich in proteins.
C. A well-balanced diet contains proteins, fats, minerals and vitamins.
D. Biscuits, cake and sweets may provide us with energy.
5.People can get all the minerals the body needs by().
A. having a balanced diet
B. drinking more milk
C. eating fruits and vegetables
D. having more fish and eggs
第3题：
Which of the following is NOT true_________?
A． People may have more healthful food at McDonald's.
B． Scientists can control levels and types of substances to grow meat in labs.
C． Lab meat is less likely to be polluted like other kinds of meat.
D． It will not be long before lab meat is available in supermarkets.
细节题。四个选项所涉及内容在文章第二段都有提及，根据原文，只有选项D(It will not be long before lab meat is available in supermarket．)与原文“The technology has a long way to go before meat could hit supermarkets．”不符，因此选项D为正确答案。
第4题：
Which foods should be eaten to keep us healthy?Let us look at some important vitamins for these answers.
Vitamin A helps prevent skin and other tissues from becoming dry.People who do not get enough vitamin A cannot see well in darkness.Vitamin A is found in fish liver oil.It also is in the yellow part of eggs.Sweet potatoes,carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A.
Vitamin B-one changes starchy（含淀粉的）foods into energy. It also helps the heart and nervous system work smoothly.Without it,we would be weak and would not grow.Vitamin B-one is found not just in whole grains like brown rice,but also in other foods.These include beans and peas,nuts,and meat and fish.
Vitamin B-twelve is needed so folic acid（叶酸）can do its work. Together, they help produce red blood cells.Vitamin B-twelve is found naturally in foods such as eggs,meat,fish and milk products.Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy.Vitamin B-twelve is found in green leafy vegetables and other foods,like legumes and citrus fruits.In some countries,it is added to products like bread.
Vitamin C is needed for strong bones and teeth,and for healthy blood passages.It also helps wounds heal quickly.The body stores little vitamin C.So we must get it every day in foods such as citrus（柑橘类）fruits,tomatoes and uncooked cabbage.
Vitamin D increases levels of the element calcium in the blood.Calcium is needed for nerve and muscle cells to work normally.It also is needed to build strong bones.Ultraviolet light from the sun changes a substance in the skin into vitamin D.Fish liver oil also contains vitamin D.
Vitamin K is needed for healthy blood.It thickens the blood around a cut to stop bleeding. Vitamin K can be found in pork products,liver and in vegetables like cabbage,kale and spinach.
A:Right
B:Wrong
C:Not mentioned
第三段最后两句说，维生素B，不仅存在于全谷类食品，如糙米，还存在于其他的食物里，包括豆类、坚果、肉类和鱼类。因此选B。
第四段最后一句："In some countries, it is added to products like bread.”在一些国家，它被添加到面包等产品中，而不是in most countries。因此选B。
第五段最后一句说，所以我们必须每天食用柑橘类水果、西红柿和生卷心菜以摄取维生素C。因此选A。
第二段第三句说，鱼肝油富含维生素A。第六段最后一句说，鱼肝油也含有维生素D。因此选D。
最后一段说，健康的血液需要维生素K。它通过增加创口周围的血液私稠度来止血。猪肉产品、肝脏和蔬菜（像卷心菜、甘蓝和菠菜）富含维生素K。因此选B。
维生素有助于人体健康，但文章并没有提到维生素越多越好，因此选择C。
第5题：
Which of the following statements can best be inferred from the passage?
A. Fishes only "speak" to communicate with each other.
B. Researches are now being made to study the significance of fish sounds.
C. Sea animals have a sharper hearing ability than men.
D. Sounds made by fish cannot be transmitted through the air.
答案为 B。根据第一段第二至第五句， Actually， their talk may be as meaningful as much of our own．For example，some sea animals use their "voices" to locate their food in the ocean expanses；others use their "voices" to let their fellows know of their locations；and still others，as a means of obtaining mates．Sometimes, "speaking" may even mean the difference between life and death to a sea animal．It appears in some cases that when a predator approaches，the prey depends on no more than the sounds it makes to escape 作出该项选择。选项 A中only不确切；选择 C和D在文中都没提到。
第6题：
Milk contains rich proteins, and many people have it for lunch.
第7题：
A. All OSPF routers in stubby areas can have type 3 LSAs in their database.
B. All OSPF routers in stubby areas can have type 7 LSAs in their database.
C. All OSPF routers in totally stubby areas can have type 3 LSAs in their database.
D. All OSPF routers in totally stubby areas can have type 7 LSAs in their database.
E. All OSPF routers in NSSA areas can have type 3 LSAs in their database.
F. All OSPF routers in NSSA areas can have type 7 LSAs in their database.
第8题：
Why do the depository institutions have the fractional reserve banking?
A．Because they can keep a large amount of deposits from their depositors in the form. of reserves.
B．Because most of their depositors would withdraw their deposits.
C．Because only a small fraction of their depositors would deposit money during a day or week.
D．Because they can meet the need of withdrawing of their depositors and make investments in other financial assets.
解析：文章第一段提到Depository institutions...week to withdraw their deposits。存款准备金是指金融机构为保证客户提取存款和资金清算需要而准备的在中央银行的存款。存款机构能这样做是因为存款者在不定的时间内会提取存款。只有D选项的意思是与题意相符。
第9题：
Which foods should be eaten to keep us healthy?Let us look at some important vitamins for these answers.
Vitamin A helps prevent skin and other tissues from becoming dry.People who do not get enough vitamin A cannot see well in darkness.Vitamin A is found in fish liver oil.It also is in the yellow part of eggs.Sweet potatoes,carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A.
Vitamin B-one changes starchy（含淀粉的）foods into energy. It also helps the heart and nervous system work smoothly.Without it,we would be weak and would not grow.Vitamin B-one is found not just in whole grains like brown rice,but also in other foods.These include beans and peas,nuts,and meat and fish.
Vitamin B-twelve is needed so folic acid（叶酸）can do its work. Together, they help produce red blood cells.Vitamin B-twelve is found naturally in foods such as eggs,meat,fish and milk products.Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy.Vitamin B-twelve is found in green leafy vegetables and other foods,like legumes and citrus fruits.In some countries,it is added to products like bread.
Vitamin C is needed for strong bones and teeth,and for healthy blood passages.It also helps wounds heal quickly.The body stores little vitamin C.So we must get it every day in foods such as citrus（柑橘类）fruits,tomatoes and uncooked cabbage.
Vitamin D increases levels of the element calcium in the blood.Calcium is needed for nerve and muscle cells to work normally.It also is needed to build strong bones.Ultraviolet light from the sun changes a substance in the skin into vitamin D.Fish liver oil also contains vitamin D.
Vitamin K is needed for healthy blood.It thickens the blood around a cut to stop bleeding. Vitamin K can be found in pork products,liver and in vegetables like cabbage,kale and spinach.
A:Right
B:Wrong
C:Not mentioned
第三段最后两句说，维生素B，不仅存在于全谷类食品，如糙米，还存在于其他的食物里，包括豆类、坚果、肉类和鱼类。因此选B。
第四段最后一句："In some countries, it is added to products like bread.”在一些国家，它被添加到面包等产品中，而不是in most countries。因此选B。
第五段最后一句说，所以我们必须每天食用柑橘类水果、西红柿和生卷心菜以摄取维生素C。因此选A。
第二段第三句说，鱼肝油富含维生素A。第六段最后一句说，鱼肝油也含有维生素D。因此选D。
最后一段说，健康的血液需要维生素K。它通过增加创口周围的血液私稠度来止血。猪肉产品、肝脏和蔬菜（像卷心菜、甘蓝和菠菜）富含维生素K。因此选B。
维生素有助于人体健康，但文章并没有提到维生素越多越好，因此选择C。
第10题：
Which foods should be eaten to keep us healthy?Let us look at some important vitamins for these answers.
Vitamin A helps prevent skin and other tissues from becoming dry.People who do not get enough vitamin A cannot see well in darkness.Vitamin A is found in fish liver oil.It also is in the yellow part of eggs.Sweet potatoes,carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A.
Vitamin B-one changes starchy（含淀粉的）foods into energy. It also helps the heart and nervous system work smoothly.Without it,we would be weak and would not grow.Vitamin B-one is found not just in whole grains like brown rice,but also in other foods.These include beans and peas,nuts,and meat and fish.
Vitamin B-twelve is needed so folic acid（叶酸）can do its work. Together, they help produce red blood cells.Vitamin B-twelve is found naturally in foods such as eggs,meat,fish and milk products.Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy.Vitamin B-twelve is found in green leafy vegetables and other foods,like legumes and citrus fruits.In some countries,it is added to products like bread.
Vitamin C is needed for strong bones and teeth,and for healthy blood passages.It also helps wounds heal quickly.The body stores little vitamin C.So we must get it every day in foods such as citrus（柑橘类）fruits,tomatoes and uncooked cabbage.
Vitamin D increases levels of the element calcium in the blood.Calcium is needed for nerve and muscle cells to work normally.It also is needed to build strong bones.Ultraviolet light from the sun changes a substance in the skin into vitamin D.Fish liver oil also contains vitamin D.
Vitamin K is needed for healthy blood.It thickens the blood around a cut to stop bleeding. Vitamin K can be found in pork products,liver and in vegetables like cabbage,kale and spinach.
A:Right
B:Wrong
C:Not mentioned
第三段最后两句说，维生素B，不仅存在于全谷类食品，如糙米，还存在于其他的食物里，包括豆类、坚果、肉类和鱼类。因此选B。
第四段最后一句："In some countries, it is added to products like bread.”在一些国家，它被添加到面包等产品中，而不是in most countries。因此选B。
第五段最后一句说，所以我们必须每天食用柑橘类水果、西红柿和生卷心菜以摄取维生素C。因此选A。
第二段第三句说，鱼肝油富含维生素A。第六段最后一句说，鱼肝油也含有维生素D。因此选D。
最后一段说，健康的血液需要维生素K。它通过增加创口周围的血液私稠度来止血。猪肉产品、肝脏和蔬菜（像卷心菜、甘蓝和菠菜）富含维生素K。因此选B。
维生素有助于人体健康，但文章并没有提到维生素越多越好，因此选择C。