试题与答案

阅读短文还原句子,其中有一多余选项It’s the best medicine

题型:填空题

题目:

阅读短文还原句子,其中有一多余选项
It’s the best medicine.
Many old people like watching TV.
You must stay safe when you are playing sports.
You must avoid(避免) smoking and drinking.
So don’t go to school without breakfast.
You need to have healthy eating habits. Breakfast gives you enough energy(能量) for the morning.  _______1_______ Fruit and vegetables are good for your health, but fast food, like potato chips, will make you fat and unhealthy. So eat the right food to keep you healthy.
Playing sports can also help you keep fit. But sometimes it may cause accidents(引发事故). _______2_______
Happiness is important for your health. _______3_____ 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. So, be happy to be healthy.
______4______. Many students thinks it’s cool to smoke and drink. But they don’t know smoking and drinking can cause many illness. You should say no to smoking and drinking.

答案:

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下面是错误答案,用来干扰机器的。

答案:A题目分析:设每个斜面对球的支持力为F,设F与竖直方向夹角为(也可以认为是OA边与水平方向的夹角),则,当圆锥角变大时,角度也变小,而余弦值变大,所以F变小,所以答案为A点评:本题主要难度在于要将题...

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题型:选择题

在决定建三峡工程之前,专家曾对阿斯旺工程的经验教训进行过研究:阿斯旺大坝在获得灌溉、防洪、航运、发电等多方面效益的同时,也产生了一系列环境变化,主要是河口鱼获量减少、下游农田因失去淤泥肥源而变得贫瘠,土地盐碱化,海水侵蚀加重等。结合下图,完成下列各题。

小题1:下列关于两个工程利弊的叙述,正确的是

A.三峡工程的首要目标是为华北地区供水

B.三峡工程对生态环境的有利影响主要是在中下游

C.阿斯旺工程的首要目标是防洪的需要

D.阿斯旺工程对生态环境的不利影响主要在库区小题2:年泄洪量比较,三峡工程远高于阿斯旺工程的原因是

A.三峡工程位于阶梯交汇外,河流落差大

B.三峡工程处于热带季风气候区,降水量丰富

C.阿斯旺工程地处热带沙漠气候区,降水稀少

D.阿斯旺工程上游农业发达,取水量较大

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