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【单选题】
环境监测器（）实际上是单片计算机系统，其主要功能是接收探测器送来的报警信号，经过处理之后，产生告警信息。A.
CMU
B.
PCU
C.
EMU
D.
MISU
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【简答题】It
costs four times as much to gain a new as it costs to keep an old one.
【单选题】I like this 3G cellphone very much, but it costs almost _______that one.
A.
four times as many as
B.
as four times many as
C.
four times as much as
D.
as four times much as
【单选题】A commonly used rule of thumb is that it costs approximately ____ times as much to get a new customer as it does to keep an existing customer.
A.
three
B.
four
C.
five
D.
six
【单选题】I like this 5G cellphone very much, but it costs almost _______that one.
A.
four times as many as
B.
as four times many as
C.
four times as much as
D.
as four times much as
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