音乐会上台上优美的琴声来自于琴弦的______，琴声通过______传播到台下观

根据对话情景和内容，从对话后所给的选项中选出能填入空白处的最佳选项。选项中有两项为

多余选项。

Jack: It's good to see you again. You are an engineer, aren't you? 1._____

Michael: No. I worked in Canada for two years. It's a good place.

Jack: That sounds interesting, but I'm sure you are glad to be back. 2._____ 

Michael: I've been seeing old friends, visiting my family, buying things for my new flat and just having

             a holiday.3._____.

Jack: Haven't you got another job?

Michael: Yes. 4._____ But what about you?

Jack: I've got a job in a company that sells office equipment-paper, typewriters-you know the sort of thing.

        5._____ but I'm a salesman and I've been traveling all over Europe for the last two years, I'm still

        traveling and still selling. I like working abroad.

A. It may sound rather dull.

B. I enjoyed myself there very much

C. How do you like your job?

D. What have you been doing since you came back?

E. Did you stay in England after you left the university?

F. I started working here a week ago.

G. I have been really busy these days.

为提高风机的发电量可以通过增加（）来降小由地面粗糙度引起的（）的影响。

某男性，年龄37岁，建筑工人，长期使用各种振动工具搅拌水泥等工作。因手指麻木和感觉异常等症状而就诊。此工人可能患何种疾病（）

A．局部振动病

B．末梢神经炎

C．风湿性关节炎

D．周围神经炎

E．骨关节病

阿米巴肝脓肿外科手术引流的指征是（）

A.脓肿有可能破溃

B.内科治疗疗效欠佳

C.脓肿穿破引起化脓性腹膜炎

D.脓肿靠近体表且体积较大

E.一经确诊为肝阿米巴脓肿，均应立即手术治疗