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A.A. "
B.B. How
C.C. How much
D.D. How many
Many people smoke. They smoke because they think it makes them cooler and it is a good way for them to show their manhood.
A.Subject +what
B.Subject + example
C.Subject+ why
D.Subject +how
(a) How many particles does the drop collect？
(b) What is the percentage increase m mass of the drop due to these particles？
1. What does ‘ them' refer to in this sentence？
2. Can you replace this by ‘ many' here？
3. Can you replace this by ‘ is' here？
4. Can you use the word ‘ some' here？
5. Can you replace this by 'what' here？
6. Can you replace this by ‘ A' here？
7. Can you leave out the word ‘ that' here？
8. Can you replace this by ‘ aren' t' here？
9. Can you replace this by 'which' here？
10. Can you replace this by 'himself' here？
as in Fig. 4-62, A liquid jet of velocity Vjand area Ajstrikes a single 180° bucket on a turbine wheel rotating at angular velocity Ω. Find an expression for the power P delivered. At what Ω？ is the power a maximum？ How does the analysis differ if there are many buckets, so the jet continually strikes at least one？
(清华大学2006--2007学年春季学期期中考试试题)as in Fig．4-62，A liquid jet of velocity Vj and area Aj strikes a single 180°bucket on a turbine wheel rotating at angular velocity Ω．Find an expression for the power P delivered．At what Ω？is the power a maxi mum？How does the analysis differ if there are many buckets，so the jet continually strikes at least one？
用你自己作为劳动力的经历来回答下列问题：
a．当你和你的朋友找一份兼职工作时，一般需要几周？在你找到一份工作之后，一般能持续工作多少周？
b．根据你的估计，计算(按每周的比率)你的就业率．厂与你的离职率s。(提示：如果f是就业率，那么平均失业的时间长度就是1/f)
c．你所代表的人群的自然失业率是多少？
Answer the following questions about your own experience in the labor force:
a．When you or one of your friends is looking for a part-time job, how many weeks does it typically take？ After you find a job, how many weeks does it typically last？
b．From your estimates, calculate (in a rate per week) your rate of job finding f and your rate of job separation s. (Hint: If f is the rate of job finding, then the average spell of unemployment is 1/f)
c．What is the natural rate of unemployment for the population you represent？
Have you ever noticed advertisements which say "Learn a foreign language in six weeks, or your money back! From the first day your pronunciation will be excellent. Just send. . . " and so on？ Of course, it never happens quite like that. The only language that is easy to learn is the mother tongue. Think how much practice that gets!Before the Second World War people usually learnt a foreign language in order to read the literature of the country. Now speaking the foreign language is what most people want. Every year many millions of people start learning one.
Some people try at home, with books and records or tapes; some use radio or television programmes; others go to evening classes. If they use the language only twice or three times a week, learning it will take a long time. A few people try to learn a language fast by studying for six or more hours a day. It is clearly easier to learn the language in the country where it is spoken. However, most people cannot afford this, and for many it is not necessary. They need the language in order to do their work better. For example, scientists and doctors chiefly need to be able to read books and reports in the foreign language. Whether the language is learnt quickly or slowly, it is hard work. Machines and good books will help, but they cannot do the student's work for him.
31. The advertisements say it would be easy to_________.
A. speak your native language better
B. keep in mind any foreign language
C. learn a foreign language within several weeks
D. learn by heart a foreign language
32. Nowadays most people want to learn_________.
A. about the country where a language is spoken
B. to speak a foreign language
C. to read essays in the foreign language
D. to write in the foreign language
33. Before the 2nd World War people usually learnt a foreign language in order to_________.
A. communicate with their foreign friends
B. read the foreign newspaper
C. read the literacy works of the country
D. talk with their foreign friends
34. If you only use the language twice or three times a week ,_________.
A. it is impossible to learn it well
B. it will take a long time to learn the foreign language
C. you will never learn the language well
D. perhaps you will learn harsh language
35._________is very important whether a foreign language is learnt quickly or slowly.
A. Talent
B. Intelligence
C. Ability
D. Hard work
