填空题

This passage gives an introduction of ______.

【参考答案】

the nature and origin of icebergs
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单项选择题
A.It’s less expensive.B.It’s more comfortable.C.It’s faster.D.It’s more direct.
A.It’s less expensive.
B.It’s more comfortable.
C.It’s faster.
D.It’s more direct.
单项选择题
A.To warn of dangers.B.To explain traffic regulations.C.To wake up drivers who are falling asleep.D.To give directions.
A.To warn of dangers.
B.To explain traffic regulations.
C.To wake up drivers who are falling asleep.
D.To give directions.
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