单项选择题

A．They are newer than the formations in most caves.
B．They were formed by sulfuric acid.
C．They have been artificially preserved.
D．They are smaller than those in any other cave.
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单项选择题
A．He’s also interested in American literature.B．He hasn’t decided if he would take the literature class.C．The woman should have already finished her paper.D．The woman’s topic may not be appropriate.
A．He’s also interested in American literature.
B．He hasn’t decided if he would take the literature class.
C．The woman should have already finished her paper.
D．The woman’s topic may not be appropriate.
单项选择题
A．They are more likely to damage the cave.B．It’s hard for them ’to stay awake.C．They tend to break their equipment.D．They may imagine seeing things that aren’t really there.
A．They are more likely to damage the cave.
B．It’s hard for them ’to stay awake.
C．They tend to break their equipment.
D．They may imagine seeing things that aren’t really there.
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