单项选择题

They are confronting tremendous and more complicated problems.（）

A．discussing
B．solving
C．undertaking
D．facing

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单项选择题
A child hears his mother tongue spoken from morning till night in its genuine form.（）

A．good
B．correct
C．real
D．perfect
单项选择题
It's no use just telling me to do it; give me positive advice as to how to do it.（）

A．absolute
B．helpful
C．convinced
D．detailed
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