读课文《孩子考科学家》，根据内容填空
《孩子考科学家》写的是一对小兄弟特别喜欢____，他们听爸爸讲了科学家____的故事后，对他很感兴趣，当他们听说达尔文要来他们家做客时，就准备____他，于是，他们捉了许多虫子，拼凑成一条____的虫子标本给达尔文看，被达尔文识破后，兄弟俩对达尔文爷爷更加尊敬了。
一箱汽油用掉一半后，剩下的汽油与原来一箱汽油相比较，大小变为原来一半的物理量是（ ）
物质的下列性质中，属于化学性质的是（ ）
— For your health and study, my boy, I am afraid you .
Sailing Welcome to our TV show On the Go. Today we are going to talk about an exciting sport—sailing. First let’s talk to Sue，an 18yearold girl who loves sailing.Host: When did you start sailing，Sue?Sue: I started sailing when I was 15 years old.Host: Is it a difficult sport to learn?Sue: Yes，it is more difficult than any other sport. For example，you need to learn about the wind directions(方向) and how to move the sails in the right way.Host: How often do you go sailing?Sue: I go sailing with my father every weekend.Host: How far do you go sailing?Sue: It depends on the wind.Host：OK. Thank you，Sue. Good luck with your sailing.Are you interested in sailing after hearing the interview?If you want to learn sailing，here is a chance for you .The Water Sports Center will organize sailing lessons. Each lesson will cost you ￥20 and there are 5 lessons altogether(总共)．
关节活动起来非常灵活，与之有关的结构特点是关节结构里有（ ）
