Many pure metals have little use because they are too soft,rust too easily,or have some other drawback.A:property B:additive C:disadvantage D:disparity

A

The undersea world is very beautiful． Now more and more people want to dive in the water to find the secrets there． Scuba diving is a new sport today． It can take you into a wonder-ful undersea world．

You will find many strange animals in the sea． Some are as large as a school bus． Many sea animals give out light in the dark and some have sharp teeth．During the day， there is enough light． Here， under the sea， everything is blue and green．When fish swim nearby， you can catch them with your hands． When you have bottles of air on your back， you can stay in deep water for a long time． However， you can-t dive too deep． And you must be very careful when you dive in deep water．The deep sea is not an easy place to live in． It-s cold， and it，s dark， too． The deeper it is， the less sunlight there is． At about 3，000 feet， there is no light at all． It is very dark in the sea． Many fishes have no eyes． Some have big eyes． A few have eyes on one side． Besides the cold and the darkness， deep-sea animals face a third danger-other animals．

Animals eat! They must find food to eat． Many animals eat plants． However， some am-mals eat meat． This means these sea animals have two big jobs． They need to find animals as food， and they have to try not to become other animals' meal．

( )21． Why do people want to dive in the sea? Because ________ ．

A．they want to catch fish

B． they want to find the secrets of the undersea world

C． the sea is deep

D， there are all kinds of plants in the sea

Having acknowledged receipt of the interview letter，you must prepare for the interview. Firms usually take a good deal of trouble over interviews，and there may be three or more people present，which can be a little frightening. Very often the personnel officer will begin by some words of welcome and an invitation to you to tell them a little about yourself. This is really inviting you to repeat the information you have already supplied on the application form，and which they have already read，but it does have some point. It will put you at your ease，because at least you know all about your own level of achievement and can speak about it confidently. It helps them assess your ability to communicate and your serf-esteem. Some people have too high an opinion of themselves，some take an unduly pessimistic view of their achievements，while others have a nicely balanced assessment of their own abilities.

A. No,I still have a few.

B. No,I still have a little.

C. Yes,I have some.

D. Yes,I have many.

Since tablet computers and smart phones have（ ）interface, many people believe that all home and business computers will eventually have this kind of interface too.

A.CRTB.LEDC.Touch-screenD.Large screen

A.much too,too much

B.too much,much too

C.so many, too

D.to, much

30． Which is right according to the passage?

A． People have too much time to talk with each other．

B． Life now is very simple．

C． Some families have become single-parent families．

D． Lots of mothers stay at home and look after their children．

A、because they don't have what they actually want

B、no beautiful young ladies showed up

C、steamed fish with all the little bones left in

D、too many children making noises

Some people are against killing wolves because ．

A．wolves help to keep the ecological balance in the wildemess

B．there is too small a wolf population in the wilderness

C．there are too many deer in the wilderness

D．wolves are afraid of people and never attack people

Hurry up. We don't have____time.

A. many

B. enough

C. too many