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【简答题】
The noise killing system is not yet popular mainly because --' [ A]it is still being tried out [ B]drivers still have their doubts [C] it increases the cost of car production [ D] carmakers are not sure if it is necessary
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【简答题】若函数f（x）满足：在定义域D内存在实数x 0 ，使得f（x 0 +1）=f（x 0 ）+f（1）成立，则称函数f（x）为“1的饱和函数”．有下列函数： ①f(x)= 1 x ；②f(x)= 2 x ； ③f（x）=lg（x 2 +2）； ④f（x）=cosπx， 其中你认为是“1的饱和函数”的所有函数的序号为______．
【单选题】Mrs.Frobisher helped catch the bank robber because .
A.
he just happened to be in his way of escape
B.
she happened to wave her stick in the air and hit him
C.
she had a sense of what’s right and what’s wrong
D.
she wanted to prove that she was not so useless
【单选题】The robber was just about to drive off in a stolen car when the guard came running out.
A.
(of a driver, car, etc.) to leave
B.
to force sb./sth. to go back or away
【简答题】若函数 f(x)= 1 x+1 ，则函数y=f（f（x））的定义域为______．
【简答题】若函数f（x）的定义域为[0，4]，则 g(x)= f(2x) x-1 的定义域为______．
【简答题】若函数f(x)的定义域是[0，1]，则函数f(2x)-f(x+ )的定义域为（ ）。
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