单项选择题

A．Brush your teeth right before you go to bed in the evening.
B．Have as few of your teeth pulled out as possible.
C．Have your teeth X-rayed at regular intervals.
D．Clean your teeth shortly after eating.
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单项选择题
A．The islands are very different from the North.B．The islands are a great distance from the North.C．The islands are similar to the North.D．The islands make her cry for the North.
A．The islands are very different from the North.
B．The islands are a great distance from the North.
C．The islands are similar to the North.
D．The islands make her cry for the North.
单项选择题
A．Taking pictures under water.B．Connecting pipelines.C．Planting sea weeds.D．Placing explosives under the water.
A．Taking pictures under water.
B．Connecting pipelines.
C．Planting sea weeds.
D．Placing explosives under the water.
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