单项选择题

A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
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单项选择题
A．Just so so.B．Quite good.C．Fewer than other jobs.D．None of them know the salary.
A．Just so so.
B．Quite good.
C．Fewer than other jobs.
D．None of them know the salary.
填空题
When someone gets near, an armadillo will go down its retreat, and then it is very difficult to ______.
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