单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He should look for a battery at the drugstore.
B．The drugstore may not be open at this hour.
C．He should have tried the radio earlier.
D．She doesn’t know how to open the radio.
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单项选择题
A．likeB．asC．alsoD．too
A．like
B．as
C．also
D．too
单项选择题
What does the word encryption (Line 4, Para. 4) possibly mean
A．Using of various signals for communication.
B．Writing message or information in secret code.
C．Automatic ally operated positioning system.
D．Accuracy checking device.
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