采用哥特氏弓描记法确定上下颌水平关系时，当描记针位于哥特氏弓形描记轨迹顶点时，下颌处

补全对话

     根据对话情景和内容, 从对话后所给的选项中选出能填入每一空白处的最佳选项, 选项

中有两个为多余选项.

Bruce:    1    in English

Zhou: I find listening really hard. Some times it's just impossible to understand.

Bruce: Well, you just need lots of practice. __2_.

Zhou: That's easier said than done!

Bruce: __3   . Then you can listen to China Radio International or BBC English programs on the radio.

Zhou: __4__.

Bruce: Of course. And __5_and some books to go with them? I'm sure you'll find them useful.

A. Why don't you buy a radio?

B. Yes, that's a good idea.

C. Do you think that would help?

D. The more you listen to English, the easier it becomes.

E. you'd better find an English pen friend.

F. What do you find hardest?

G. why not buy some English tapes?

宋代诗人陈与义乘坐小船在风和日丽的春日出游时曾经写下如下一首诗：飞花两岸照船红，百里榆堤半日风．卧看漫天云不动，不知云与我俱东．在该诗中“卧看漫天云不动”中卧看云不动是以______为参考系．

Mr. Smith likes traveling _______; but his wife enjoys _______. 

A．by train; taking a taxi

B．on train; by taxi

C．by train; by taxi

D．on train; taking a taxi

缪希雍对内虚暗风，大有发明。提出治当 ______以救其标；次治其本，或______或 ______或______。其用药甘润清灵，为临床中风之治，大开门经。

车站出站信号机及发车进路信号机采用（）、（）、（）三灯位矮型信号机。出站开放引导信号时，点亮（）色灯光和（）色灯光。