水是最普通、最常见的物质之一．

（1）“水”有很多种，下列“水”属于纯净物的是　____ 　（填字母序号）．

A．河水　　　　　B．自来水　　　　　　C．矿泉水　　　　　　D．蒸馏水

（2）下列做法会造成水体污染的是（填字母）____ 　．

A．随意弃置废旧电池　　　　　　　　　　       B．含二氧化硫的工业废气任意排放

C．工业废水处理达标后再排放　　　　　       　D．严格监管化肥和农药的使用．

根据拼音写汉字。

根据下面材料，回答有关问题。

科学家在对黑猩猩、大猩猩、猩猩、长臂猿的DNA分子进行分析的基础上，主张黑猩猩和大猩猩应该和人划分到一个分类属性．分析结果如下：在上述四种类人猿中，长臂猿与人类DNA分子相差最大，猩猩次之，而黑猩猩与人类DNA分子相差较小，并且小于黑猩猩和大猩猩之间DNA分子的差别．

从方框中选择恰当的词并用其适当形式填空。

Host: Welcome to 9 o'clock Weekend Talk. We're talking to Bill, a____ boy. He is from US. Hello, Bill. Welcome to the show.

Bill: Thank you.

Host: You came to China five years ago. Your Chinese must be very good.

Bill: I practice ____ it every day. I ____ reading Chinese stories and listening to Chinese songs.

Host: Do you like to play ____?

Bill: Yes, I do. And basketball is my favorite.

Host: Really? What do you ____ baseball?  

Bill: I love it, too. ____ American boys love to play it.

Host: Do you like to watch TV?

Bill: Yes, I do.

Host: What do you think of soap shows?

Bill: I ____ them. They are really boring.

Host: ____ Chinese Cooking?

Bill: I don't mind it. In fact, my mom loves it.

Host: How do you ____ China?

Bill: It's great.

Host: OK! Thank you for ____ us, Bill!

Bill: You're welcome.