单项选择题

Natural calamities include heavy weather, thunder storm and lightning, flood, earthquake and fire etc.
A、正确
B、错误

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How many semantic relations are there among sentences? Give examples.
A.
单项选择题
We are sending you a representative selection of our most popular lines and you will find a ready _____ for them.
A．sales
B．sell
C．selling
D．sale
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