单项选择题

She was so obstinate that she wouldn't adjust her opinions.

A．inflexible
B．alert
C．wise
D．talented
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单项选择题
Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.
A．are caused by
B．explain
C．derive from
D．constitute
单项选择题
Recent studies have identified four major global environmental risks— acid rain, ozone depletion, deforestation and the greenhouse effect.
A．recognized
B．proved
C．got rid of
D．multiplied
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