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
Pre-European Aboriginal tribes closer to the coast had access to a greater variety of food plants then tribes further inland.
A．Y
B．N
C．NG
单项选择题
A．She has no objection.B．She is a little worried.C．She is very supportive.D．She is very pleased.
A．She has no objection.
B．She is a little worried.
C．She is very supportive.
D．She is very pleased.
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