Question

【題目】 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：如果你曾經(jīng)在海里游泳過，你可能已經(jīng)注意到，海水比游泳池的水更容易漂浮。這是為什么。之后做一個小實驗說明這個現(xiàn)象。

【1】主旨大意題。根據(jù)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，后面的實驗是為了解釋前面人在海水中更容易漂浮，故選B。

【2】細節(jié)理解題。根據(jù)(If the salt water egg does not float well, mix more salt into the bowl )可知，是鹽放少的原因，故選D。

【3】推理判斷題。A. A science magazine科學雜志；B. A tour guide.旅游向?qū)В?/span>C. A news report.新聞報告；D. A geography book地理書；根據(jù)文章大意做實驗，說明人在海水中更容易漂浮及選項可知是科學實驗，故選A.

這是一篇科學實驗文，介紹了人為什么在海水中更容易漂浮。短文主題明確，結構清晰，悉心清晰。推理判斷題，細節(jié)推斷題。推理判斷就是根據(jù)文章所提供的信息，脫離字面理解的局限，抓住關鍵細節(jié)，得出合乎邏輯的結論。所以我們可以根據(jù)文章中的相關細節(jié)去判斷推理，得知答案。比如像第二題可以根據(jù)如果鹽水里的雞蛋沒有漂浮的很好，應該放更多鹽在碗里，那么反而言之就說明如果漂浮的不是很好的，說明原來的鹽放少了。