Computers ____ in offices and homes since 1970s.
A．have been used
B．had been used
C．was used
D．has been used
答案：A
题目分析:考查动词时态语态。根据since the1970s可以判断句子用现在完成时，再根据主谓一致的原则可知A选项正确。句意：自从二十世纪七十年代以来，电脑被应用于了家庭和办公室。
阅读下面短文，从方框中选择恰当的句子填入短文空白处，使短文内容完整、意思连贯。 You need to have healthy eating habits.Breakfast gives you enough energy for the morning. So don’t go to school without it. Friut and vegetables are good for your health, but fast food, like potato chips, will make you fat and unhealthy. 小题1: . 小题2: But sometimes it may cause accidents, so stay safe when you are playing sports. It’s necessary to learn about first aid(救助). Then you can help yourselves or others if an accident happens. 小题3: It is the best medicine. When you are ill, try to be happy and you’ll feel better. On the other hand, you may feel sick if you are always unhappy.小题4: 小题5: Many students think it’s cool to smoke and drink. But they don’t know smoking and drinking can cause many illnesses. You should say no to smoking and drinking.
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