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单项选择题

How are icebergs formed

A．They break off from glaciers.
B．Seawater freezes.
C．Rivers freeze.
D．Small pieces of floating ice converge.
相关考题

The author would most likely agree with which of the fo...

单项选择题The author would most likely agree with which of the following statements

A．Human cloning is a technical impossibility.
B．Human cloning may cause ethical concerns.
C．Cloning contributes to understanding of stem cells.
D．The potential medical values of cloning have been exaggerated.

Which of the following statements about early American ...

单项选择题Which of the following statements about early American hotels is NOT mentioned in the passage

A．Travelers from abroad did not enjoy staying in them.
B．Conventions were held in them.
C．People used them for both business and pleasure.
D．They were important to the community.

The reason a nose is not likely to turn into a kidney i...

单项选择题The reason a nose is not likely to turn into a kidney is that______ .

A．cells in the nose do not contain instructions
B．a nose does not contain brain cells
C．instructions in a nose cell are inactivated
D．the stern cells have not been specialized

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