系列之二：B类
单选题Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?A 12.5B 13C 14D 14.5
题目
12.5
13
14
14.5
参考答案和解析
这是一道稍复杂的计算题，设Scott七年前的年龄为X，则有X+7-（1/3X+7）=5，由此可得X=7 1/2，再加上7即是Scott现在的年龄，因此该选14.5。
相似问题和答案
第1题：
We can infer from Dr. Myers and Dr. Worm’s paper that ________.
[A] the stock of large predators in some old fisheries has reduced by 90%
[B] there are only half as many fisheries as there were 15 years ago
[C] the catch sizes in new fisheries are only 20% of the original amount
[D] the number of larger predators dropped faster in new fisheries than in the old
第2题：
There used to be an old city here, which was ()under the river about 2000 years ago.
A、insulted
B、insulated
C、buried
D、interrupted
第3题：
When did the children begin to speak English?
A. When they are 5 years old. B. When they are 6 years old.
C. When they are 7 years old. D. When they are 8 years old.
第4题：
A、has seen
B、had seen
C、have seen
D、having seen
第5题：
A、publishing/ are been used
B、published/ are using
C、published/ are being used
D、having been published/ are being used
第6题：
What is known about the influenza virus?
A. It was first found in a group of very old birds.
B. All the different strains can be found in wild birds.
C. It existed over 100 million years ago.
D. It can survive in many different places.
[解析] 见本文第一段最后一句。有证据显示病菌通过候鸟从一个地方，一个洲传带到另一个地方，另一个洲。由此可以看出病菌可以在不同的地方存活。
第7题：
The new gym is _________ as the old one.
A、three times as large
B、three times the size
C、three times larger than
D、as three times large
第8题：
28． How old is John's brother now when John is fifteen in the story?
A．Ten years old．
B． Fifteen years old
C． Twenty years old
D． Twenty-five years old．
28.D【解析】当John 10岁时，他哥哥20岁，所以当 John 15岁时，他哥哥25岁。
第9题：
Smoking is so harmful to personal health that it killing ( ) people each year than automobile accidents.
A、seven more times
B、seven times more
C、over seven times
D、seven times
解析：seven times more：8倍多
第10题：
A.Right
B.Wrong