题目内容

[A] at best
[B] at least
[C] at most
[D] at worst

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In this issue, we may probably find an article about _______ .
[ A] how to travel to Florida
[ B] a role Leonardo played in a film
[ C ] new methods of feeding animals
[ D]how to protect wildlife

It is predicted that people who will live on other planets would have to
[ A] appreciate the harsh conditions they encounter there.
[ B] depend on the natural resources available there.
[ C] take most daily necessities along with them.
[ D] engage in scientific research.

[ A] found
[ B ] caught
[ C ] punished
[ D] attacked

何谓限性遗传和从性遗传。