单项选择题

In the Mediterranean seaweed is so abundant and so easily harvested that it is never of great______.

A．fare
B．payment
C．worth
D．expense
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单项选择题
The other day, Mum and I went to St. James's Hospital, and they did lots and lots of tests on me, most of them ______ and frightening.
A．cheerful
B．horrible
C．hostile
D．friendly
单项选择题
The ______ that exists among nations could certainly be lessened if misunderstanding and mistrust wereremoved.
A．tension
B．strain
C．stress
D．intensity
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