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问题 选择题

Sue told us a story. Her voice sounded ______. [ ]

A. sweet    

B. badly     

C. clearly       

D. sadly

答案

答案：A

听力题

Visitors to Britain may find the best place to enjoy local culture is in a traditional pub(酒吧). A team of researchers have revealed(揭示) some of ____小题1:____ unknown culture of British pubs --- starting with the difficulty of getting a drink. This may sound inconvenient, but there is a ____小题2:____ (hide) meaning.

Pub culture ____小题3:____(form) to improve sociability(社会交往) in a society that is known ___小题4:___ its coldness. Standing at the bar for service allows you to chat with others ___小题5:____ are waiting to be served. The bar counter is ____小题6:____ (possible) the only place in Britain ____小题7:____ a friendly talk with strangers is considered to be entirely proper and really quite normal behavior. However, ____小题8:____ you do not follow the local rules, the experience may fall flat(一无所获). For example, if you are in a big group, it is best for one or two people to go to buy the drinks. Nothing makes the regular customers and bar staff _____小题9:____(anger) more than a group of strangers blocking all passages(过道) to the bar while ____小题10:____ chat and hesitate(犹豫) about what to order.
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解答题
已知函数f（x）满足f(x+y)=f(x)•f(y)，且f(1)=
1
2
．
（1）当x∈N+时，求f（n）的表达式；
（2）设an=nf(n)
 &(n∈N+
，求证：a1+a2+…+an＜2；
（3）设bn=
nf(n+1)
f(n)
 &(n∈N+)，Sn=b1
+b2+…+bn，求Sn．
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