单项选择题

A．150 years ago.
B．60 million years ago.
C．16 million years ago.
D．150 million years ago.
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单项选择题
A．To warn the girls against him.B．To show his dislike of the patient.C．To tell them the fact.D．To gossip about the patient.
A．To warn the girls against him.
B．To show his dislike of the patient.
C．To tell them the fact.
D．To gossip about the patient.
单项选择题
What effect does excessive positive ionization have on some people
A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do anything.
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