单项选择题

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

A．Because she has lost the book.
B．Because she has brought the wrong book.
C．Because she has forgotten to bring the book.
D．Because she has lent the book to someone else.
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单项选择题
The power of the new AUV is stored in the ______.
A．form-shifting substance
B．internal mechanism
C．spring that is pushed into a tight coil
D．external bladder
单项选择题
What is the running course of IGF-I in improving people’s brainpower
A．muscle--brain--bloodstream
B．bloodstream--muscle--brain
C．muscle--bloodstream--brain
D．bloodstream--brain--muscle
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