单项选择题

A panda's primary activity is sleep, ______ its waking hours looking for food.

A．for spending
B．that it spends
C．will spend
D．and it spends
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单项选择题
The city serves as an important railroad ______ and industrial and convention center.
A．junction
B．network
C．link
D．conjunction
单项选择题
There is no easy solution to Japan's labor ______.
A．decline
B．vacancy
C．rarity
D．shortage
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