单项选择题

Desert plants ______ two categories according to the way they deal with the problem of surviving drought.

A．break down
B．fall into
C．differ in
D．refer to
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单项选择题
In some countries preschool education in nursery schools or kindergartens ______ the 1st grade.
A．leads
B．precedes
C．forwards
D．advances
单项选择题
Such an ______ act of hostility can only lead to war.
A．overt
B．episodic
C．ample
D．ultimate
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