Question

【题目】 If you have ever been swimming in the ocean, you may have noticed that sea water is easier to float in than pool water. Here's why.

You'll need：

Two bowls Food coloring Spoon Salt Two eggs

1: Fill bowls half way with water.

2:Add 10 tablespoons of salt to one bowl, mix until it dissolves (溶解), and then add several drops of color.

3:Carefully, put an egg into each bowl of water and watch what happens.

What happens?

The egg in the plain water sinks. The egg in the salt water floats.

(If the salt water egg does not float well, mix more salt into the bowl )

The water and salt particles（粒子）in the salt water bowl are closer together it than plain water particles are. They push harder against the egg than the plain water particles do and the egg floats.

【1】The purpose of: the experiment is to explain ________________.

A.why the egg floats in the salt water

B.why people float more easily in the sea

C.how we can make the egg float in water

D.how the water and salt particles act together

【2】According to the text, if the egg in the salt water doesn’t float, which is the reason?

A.The water is too hot.B.The egg is not fresh.

C.The bowl is too small.D.The salt is not enough.

【3】What is this passage probably taken from?

A.A science magazineB.A tour guide.C.A news report.D.A geography book

Answer 1

【答案】

【1】B

【2】D

【3】A

【解析】

文章大意：如果你曾经在海里游泳过，你可能已经注意到，海水比游泳池的水更容易漂浮。这是为什么。之后做一个小实验说明这个现象。

【1】主旨大意题。根据If you have ever been swimming in the ocean, you may have noticed that sea water is easier to float in than pool water. Here's why. 可知，后面的实验是为了解释前面人在海水中更容易漂浮，故选B。

【2】细节理解题。根据(If the salt water egg does not float well, mix more salt into the bowl )可知，是盐放少的原因，故选D。

【3】推理判断题。A. A science magazine科学杂志；B. A tour guide.旅游向导；C. A news report.新闻报告；D. A geography book地理书；根据文章大意做实验，说明人在海水中更容易漂浮及选项可知是科学实验，故选A.

这是一篇科学实验文，介绍了人为什么在海水中更容易漂浮。短文主题明确，结构清晰，悉心清晰。推理判断题，细节推断题。推理判断就是根据文章所提供的信息，脱离字面理解的局限，抓住关键细节，得出合乎逻辑的结论。所以我们可以根据文章中的相关细节去判断推理，得知答案。比如像第二题可以根据如果盐水里的鸡蛋没有漂浮的很好，应该放更多盐在碗里，那么反而言之就说明如果漂浮的不是很好的，说明原来的盐放少了。