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问题 选择题

下列反应中，既属于氧化还原反应，又是吸热反应的是[ ]

A．铝片与稀盐酸反应

B．Ba(OH)2·8H2O与NH4Cl反应

C． 灼热的碳与CO2反应

D．甲烷在氧气中的燃烧反应

答案

答案：C

完形填空
阅读下列短文，根据短文内容填写表格，每空限填一词。
The world we live in is full of amazing things. Do you know the following things?
★Chocolate tastes nice but it may make the little dog die.
★We may sleep for eight hours at a time but a snail (蜗牛) may sleep for three years.
★Our ears and nose become bigger when we grow up but eyes keep the same after a person is born.
★You may think a bear walks slowly. In fact, it can run as fast as a horse.
★Cats won’t die if they fall off very high places because they can turn themselves up the right way.
★The largest animal on the earth is the blue whale (鲸). It weighs about 80 tons (吨)—more than 24 elephants.
★Most animals will die soon if they lose the head. But a cockroach (蟑螂) can live for nine or ten days when they have no head.
★Not all birds can fly. About forty kinds of birds can’t fly, like the penguin (企鹅) and the ostrich (鸵鸟).
               Some 小题1: ________ things in the world
小题2:_______
It’s nice but you can’t give it to little 小题3:_______, because it can kill them.
Snails
 They can sleep as 小题4:_______ as three years.
Our eyes
 The size of the eyes doesn’t 小题5:________ from birth.
Bears
 They can run very 小题6:_______ like a horse.
Cats
 After 小题7:_______ off very high places, they can stay alive.
Blue whales
 They are the largest animal and a blue whale’s 小题8: _______ is about 80 tons.
Cockroaches
 They can live for nine or ten days小题9:_______ the head.
Birds
 Most birds are good at小题10:_______ but some can’t.
 
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多项选择题

下列关于城市道路结构的石灰稳定土基层的质量控制，叙述正确的有()。

A.宜采用塑性指数10～15的粉质粘土、粘土，塑性指数大于4的砂性土亦可使用，土中的有机物含量宜小于10%

B.宜用l～3级的新灰，石灰的技术指标应符合规范要求

C.磨细生石灰，可不经消解直接使用，块灰应在使用前2～3d完成效解，未能消解的生石灰块应筛除，消解石灰的粒径不得小于10mm

D.水应符合《混凝土用水标准》(JGJ63)的规定

E.不宜使用饮用水或不含油类等杂质的清洁中性水pH值为6～8
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