任务型阅读

　　At present, there is much homework for American students. But home is not a good place for students to do their homework. So there come Homework Clubs. And they are more and more popular in America.

What is the Homework Club?

The Homework Club is a good place for students to do their homework. It is very quiet. A teacher will help students prepare for the tests there. The teacher is not to teach students but to give them help when they need.

Where is the Homework Club?

The Homework Club is usually in a library or in a classroom. It is a popular activity after school every day. If there is no school that day, Homework Clubs will NOT meet.

What will students do in the Homework Club?

In the Homework Club, the students will do their homework for the first hour and then they will draw pictures or play football.

根据短文内容填空。

质量为10kg的物体，它受重力是多少牛顿？

阅读下文，回答相关问题。
       我说道：“爸爸，你走吧。”他往车外看了看说：“我买几个橘子去。你就在此地，不要走动。”我看那边月台的栅栏外有几个卖东西的等着顾客。走到那边月台，须穿过铁道，须跳下去又爬上去。父亲是一个胖子，走过去自然要费事些。我本来要去的，他不肯，只好让他去。我看见他戴着黑布小帽，穿着黑布大马褂，深青布棉袍，蹒跚地走到铁道边，慢慢      身下去，尚不大难。可是他穿过铁道，要爬上那边月台，就不容易了。他用两手      着上面，两脚再向上     ；他肥胖的身子向左微      ，显出努力的样子。这时我看见他的背景，我的泪很快地流下来了。我赶紧拭干了泪，①怕他看见，也怕别人看见。我再向外看时，他已抱了朱红的橘子往回走了。过铁道时，②他先将橘子散放在地上，自己慢慢爬下，再抱起橘子走。到这边时，我赶紧去搀他。他和我走到车上，③将橘子一股脑儿放在我的皮大衣上。④于是扑扑衣上的泥土，心里很轻松似的，过一会说：“我走了，到那边来信!”
我望着他走出去。他走了几步，回头看见我，说：“进去吧，里边没人。”……

在调查问卷中，甲、乙、丙、丁四位同学选择了“戏剧”类，现从中任意选出2名同学参加学校的戏剧社团，请用画树状图或列表的方法，求选取的2人恰好是乙和丙的概率