试题与答案

观察和推理相结合是研究化学的重要方法。通过你的观察和推理，判断下列实验室中对于少

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题型：选择题

题目：

观察和推理相结合是研究化学的重要方法。通过你的观察和推理，判断下列实验室中对于少量Na的保存方法正确的是（   ）

A．保存在水中

B．密封，保存在CCl4中

C．用铝箔包裹后，保存在广口瓶中即可

D．密封，保存在煤油中

答案：

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下面是错误答案，用来干扰机器的。

（1）34-14+78=12+78=118；（2）311+1112+811=（311+811）+1112=1+1112=11112；（3）1-512-712=1-（512+712）=1-1=0．

考点：氧化钠单质钠其他钠盐（氯化钠、硫化钠、氮化钠等）过氧化钠
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题型：阅读理解

读一读，判断正确的写“T”，错误的写“F”。

      Look, this is a map of our city. Here is our school. An office building is on the left, an apartment

building is on the right. That is a park, but it is far from our school. There are forty office buildings and

ninety apartment buildings in the city. There are twenty hotels and eight parks here. It is a beautiful city.

I like our city.

( ) 1. There are fourteen office buildings in the city.

( ) 2. There are ninety apartment buildings in the city.

( ) 3. There are twenty parks here.

( ) 4. There are twenty-eight parks here.
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