The air in Lanzhou is getting much _____ now than a few years ago .

    A. clean  B. cleaner  C. cleanest  D. the cleanest

阅读下面的对话，根据上下文，从方框内选择恰当的选项补全对话。（有两项为多余选项）

A:    Excuse me, I am a reporter from a student magazine.      1.

B:     Sure, please.

A:          2.

B:     I am from Germany.

A:          3.

B:     I got here the day before yesterday.

A:    How do you like Lanzhou?

B:     I like your city very much. The people here are very friendly. But I’m still not used to the weather here. I have a sore throat today.

A:    The weather in Lanzhou is kind of dry. Drinking more water can make you feel better.

B:      Thanks for your suggestion.

A:           4.

B:     Of course not. I come here for watching Lanzhou International Marathon. And then I’m planning to go to Dunhuang for a tour.

A:    Great. Thank you for answering my questions.       5.

B:     Thank you.

The air in Lanzhou is getting much _____ now than a few years ago

1. A.
   clean
2. B.
   cleaner
3. C.
   cleanest
4. D.
   the cleanest

Lanzhou is the only capital city that the Yellow River, the second ________ river in China, passes through.。

A. long                                  B. longest                    C. longer                     D. length