问题
单项选择题
甲醇合成催化剂活性明显下降，首选的操作方法是（）。
A、降低催化剂操作温度
B、提高催化剂操作温度
C、提高系统压力
D、提高循环气量
答案
参考答案：B
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甲醇合成催化剂活性明显下降，首选的操作方法是（）。
A、降低催化剂操作温度
B、提高催化剂操作温度
C、提高系统压力
D、提高循环气量
参考答案：B
| 完形填空。 | |||
| I __1__ an uncle. His name is Ed Black. He is from America. He is an English teacher in China, now. He likes to go to the __2__ on weekends. Today Ed wants __3__ an action movie. He likes this kind of movies. And his __4__ Chinese actor is Cheng Long. But there is __5__ action movie at the movie house. There is only a comedy. Ed sees it and finds it's very __6__ . He is very happy now. He thinks action mowes and __7__ are both very good. He tells something __8__ this movie to his students when he meets __9__ . His students are happy, too. They also want to see it. " What's the __10__ of the movie?" ask his students. " Oh, sorry , I don't know, " answers Ed. | |||
| ( ) 1. A. have ( ) 2. A. school ( ) 3. A. to see ( ) 4. A. new ( ) 5. A. no ( ) 6. A. bad ( ) 7. A. comedy ( ) 8. A. about ( ) 9. A. we ( ) 10. A. name | B. has B. bed B. to look B. first B. not B. interest B. comedies B. to B. us B. price | C. having C. movies C. seeing C. favorite C. no a C. boring C. thrillers C. with C. they C. age | D. to have D. price D. looking at D. like D. / D. funny D. thriller D. at D. them D. dollar |