题目

甲、乙两个身高相同的人抬着一个木箱沿斜坡上山，木箱的悬点恰好在抬杠的中央．如图所示，则甲、乙两人所用的力F甲与F乙的关系是（ ） A．F甲=F乙 B．F甲＞F乙 C．F甲＜F乙 D．已知条件不足，所以无法判断 答案：AYou can see waste（浪费）everywhere in the school. Some students ask for more food than they can eat and others often forget to turn off the lights when they leave the classroom. They say they can afford these things. But I don’t agree with them. Waste can bring a lot of problems. Although China is rich in some resources（资源）, we are short of others, for example, fresh water. It is reported（据报道） that we will have no coal （煤）or oil to use in 100 years. Think about it. I think we should say no to the students who waste things every day. Everybody should stop wasting as soon as possible. In our everyday life, we can do many things to stop waste . For example, turn off the water taps when we finish washing, turn off the lights when we leave the classroom and try not to order more food than we need. Little by little, everything will be changed. We can stop waste one day if we do our best to form（养成）the habit of saving. 1.From the passage we know that some students often _________ in the school. A．eat too much                          B．don’t work hard C．waste things                           D．throw rubbish everywhere 2.Which is NOT mentioned（提及） in this passage? A．Fresh water.       B．Forest.            C．Oil.              D．Coal. 3.What may happen （发生）in 100 years? A．We may still have enough oil.              B．We may still have enough coal. C．We may have a little oil.                  D．We may have no coal or oil to use. 4.Which of the following is TRUE? A．Waste brings problems.                  B．Waste won’t bring problems. C．China is rich in fresh water.                D．Students never waste things.