Question

【題目】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（木簽） 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（推斷）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】

本文描述了一個(gè)有趣的實(shí)驗(yàn)，用涂了油的竹簽扎氣球，氣球最后不會(huì)破。

【1】

細(xì)節(jié)理解題。根據(jù)表格中“What will happen?”可知，經(jīng)過(guò)前面四個(gè)步驟，接下來(lái)就能看到最后會(huì)發(fā)生什么，也就是看到結(jié)果，所以此處使用Result。故選B。

【2】

推理判斷題。根據(jù)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，分子與油混合，緊緊地粘在一起，而竹簽上的油封住了洞口，空氣無(wú)法流出，所以說(shuō)空氣很難從洞里出來(lái)，因?yàn)橛秃头肿诱吃谝黄�。故選D。