单项选择题

A．Because it happens very fast.
B．Because it gives eyes a break.
C．Because it moistens eyes.
D．Because it relaxes eyes.
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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.
A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
填空题
variation
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