试题与答案

叉车是具有装卸搬运功能的机械。( )

题型:问答题

题目:

叉车是具有装卸搬运功能的机械。( )

答案:

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题型:阅读理解

阅读理解,根据要求完成下面的题目。

      Earth Day is on April 22nd. It was started by an American-Nelson. In 1970, about 20 million Americans

celebrated the first Earth Day. 

      Every day, we take important things from the earth, like trees, water, and oil. Our factories, cars, and

garbage (垃圾) make the air, water, and land dirty. If we are not careful, we will have no trees, no clean water

and air, and no food. 

      Earth Day tells us to be kind to the earth. Use less water, plant more trees…… 

      The earth is ours, so we should help the earth everyday, not just on Earth Day!

1. When is the Earth Day?[ ]

A. On April 21st.

B. On April 22nd.

C. On April 2nd.

2. Who celebrate the first Earth Day? [ ]

A. Americans.

B. Chinese.

C. All the people on the earth.

3. What is the article (短文) about?[ ]

A. Nelson started the Earth Day.

B. We should help the earth on Earth Day.

C. Protecting the earth is very important.

仿照例句,将句子补充完整。(不可以抄写例句中的画线部分)

例: Earth Day tells us to be kind to the earth. Use less water, plant more trees……

     What should you or shouldn't you do to the earth?

4. _____________________________________________________________________

5. _____________________________________________________________________

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题型:问答题

(1)分别取Wg钠、镁、铝与足量的盐酸反应,在相同条件下产生氢气的体积比是______;

(2)分别取0.1mol钠、镁、铝与足量的盐酸反应,在相同条件下产生氢气的体积比是______;

(3)若产生相同物质的量的氢气,所需钠、镁、铝的质量比为______;

(4)若产生相同体积(同温同压下)的氢气,所需钠、镁、铝三种金属的物质的量之比为______;

(5)若将0.2mol金属钠、铝、铁分别投入到10mL1mol/L的盐酸中,在标准状况下,产生氢气的体积大小顺序是______;

(6)把0.5mol钠投入到m1g水(过量)中得到a溶液,把0.5mol镁投入到m2g盐酸(过量)中得到b溶液,若m1=m2,则a、b质量的大小关系是______.

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