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问题 填空题

音乐会上，演员正在演奏二胡，二胡发声是因为琴弦在______，演奏过程中，演员不断调整手指在琴弦上的按压位置是为了改变声音的______．

答案

演员在表演二胡时，用弓拉动琴弦，使琴弦振动发声；当不断调整手指在琴弦上的按压位置，琴弦的振动快慢就会不一样，故发出声音的音调就会不同．

故答案为：振动，音调．

填空题
用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。
however    before    name    well    worst    notice    also    twice    and    give

                                                               Naming the Baby
     Parents always think their babies are very special. They want others to    1    their children. For this reason,
they sometimes give their children unusual    2    . They may choose names such as Chelma, Ukiah, Brianna,
or Elvira. There are some advantages to this practice. A child who is    3    an uncommon name may feel
special from childhood.    4    , sometimes we remember people with unusual names    5    than we remember
people with ordinary names.     
         6   , unusual names can cause problems. They can be hard for teachers and friends to pronounce.
They can also be hard to spell,    7    computers may automatically (自动地) change them. For example,
June may become July. Some people may have a bad impression on an unusual name    8    they even meet
the person.    9    of all, other children sometimes don't like kids with uncommon names. The message for
parents is, "Think    10    before you give your child an unusual name."
1.______ 2.______ 3.______ 4.______ 5.______
6.______ 7.______ 8.______ 9.______ 10.______
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单项选择题

三极管的电流放大倍数，是变化的集电极电流与（）的比值。

A.电源电流

B.发射极电流

C.变化的基极电流

D.输出电流
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