单项选择题

A．In the early 1900’’s.
B．In the mid-1800’’s.
C．In the early 1800’’s.
D．In the late 1800’’s.
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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.
A．Because it happens very fast.
B．Because it gives eyes a break.
C．Because it moistens eyes.
D．Because it relaxes eyes.
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.
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