单项选择题

In our class, when the bell rang and the teacher closed his book, it was a（）for everyone to stand up.

A．signal
B．chance
C．mark
D．measure

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单项选择题

—（）do you visit your grandparents before —Every winter.

A．How long
B．How often
C．How soon
D．How much

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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