单项选择题

Your compass and clock are the most essential instruments in sailing.

A．equipments
B．tools
C．instructions
D．opportunities
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单项选择题
I didn't immediately realize that how serious the situation was.
A．once more
B．right now
C．fight down
D．once again
单项选择题
Do you believe these two intimate friends used to be enemies
A．bearable
B．internal
C．close
D．believable
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