9. After watching ___TV, she played ____ guitar for an hour.
A. /, / B. /, the C. the, / D. the, the
8.---How is your tour around the North Lake? Is it beautiful?
---It ____ be, but it is now heavily polluted.
A. will B. would C. should D. must
7. It is a (an)_____ mistake among the students, so we must explain the reason to them.
A. ordinary B. common C. usual D. similar
6. -Can I get a cup of coffee for you?
- .
A. It all depends B. It’s your turn
C. Go ahead D. That’s nice of you
5. breathe A. south B. cloth C. southern D. length
第二节:词汇和语法知识(20分)
4. obey A. clone B. wonder C. position D. motto
3. amount A. country B. touch C. pronounce D. group
2. express A. experience B. exercise C. example D. extra
第一节:语音知识 (5分)
1. disagree A. absolutely B. image C. appointment D. teenager
21、(20分)风洞实验室中可以产生水平方向的、大小可调节的风力,现将一套有小球的细直杆放入风洞实验室,小球孔径略大于细杆直径。如图所示。
①当杆在水平方向上固定时,调节风力的大小,使小球在杆上匀速运动。这时小球所受风力为小球重力的0.5倍,试求小球与杆间的滑动摩擦因数;
②保持小球所受风力不变,使杆与水平方向间夹角为37°并固定,则小球从静止出发在细杆上滑下距离s所需的时间为多少?(sin37°=0.6,cos37°=0.8,g=10m/s2)
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