Question

【题目】An INTERESTING experiment

It takes a little skill to do this experiment, but the result is truly SURPRISING.

What do you need? Several rubber balloons Wooden skewer（木签） Vegetable oil Paper towel		Step l Blow up a balloon, let some of the air out of it, and tie it closed.
		Step 2 Rub some oil on skewer with paper towel.
		Step 3 Gentle twist（搓捻）and push skewer into end of balloon opposite the knot. If balloon pops（爆 炸），go back to Step 1.
		Step 4 When skewer is in balloon, slowly twist and push it out of balloon near knot.
What will happen?		____▲______ The balloon does not pop, even though it has a skewer in it.
Why won’t it pop?	Rubber is made out of long chains of molecules （分子）. The skewer pushes these molecules aside. The molecules mix with the oil and they stick together tightly. The oil on the skewer seals the hole and air cannot get out.

【1】Which is the most suitable word for “ ▲ ”?

A.TopicB.ResultC.Step 5D.Reason

【2】What can we infer（推断）from the passage?

A.It’s easy to push a skewer into and out of a balloon when doing the experiment.

B.You’d better blow as much air as possible into a balloon to make it big enough.

C.There’s no need for you to use the oil and paper towel while doing the experiment.

D.It’s hard for the air to get out of the hole as molecules and oil stick together.

Answer 1

【答案】

【1】B

【2】D

【解析】

本文描述了一个有趣的实验，用涂了油的竹签扎气球，气球最后不会破。

【1】

细节理解题。根据表格中“What will happen?”可知，经过前面四个步骤，接下来就能看到最后会发生什么，也就是看到结果，所以此处使用Result。故选B。

【2】

推理判断题。根据表格中“The molecules mix with the oil and they stick together tightly. The oil on the skewer seals the hole and air cannot get out.”可知，分子与油混合，紧紧地粘在一起，而竹签上的油封住了洞口，空气无法流出，所以说空气很难从洞里出来，因为油和分子粘在一起。故选D。