题目内容
【题目】Mary with her parents often for a walk in the park after supper.
A. go B. is going C. are going D. goes
【答案】D
【解析】
试题分析：句意：玛丽和她的父母经常晚饭后在公园里散步。go for a walk 去散步；with her parents介词短语不做主语，所以句子的主语是Mary，根据频率副词often可知用一般现在时，主语是第三人称单数，故选D。
阅读快车系列答案【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.
