单项选择题

自然选择引起的群体遗传结构的改变乃是适应性的改变。
A、正确
B、错误

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多项选择题

Which of the following are considered to be good table manners?
A、Refrain from smacking your mouth.
B、Poke around the dishes.
C、Waste food.
D、Speak with mouth full.

单项选择题

梁高800mm以上按100mm的模数递增。
A、正确
B、错误