单项选择题

What is the topic discussed in this passage（）

A．Why people hold back their tears.
B．Why people cry.
C．How to restrain one’s tears.
D．How tears are produced.

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单项选择题
In what aspect do Betty and Abby differ from most twins（）

A．They make decisions by tossing coins.
B．They are not physically separated.
C．They think exactly the same way.
D．They share most of their vital organs.
单项选择题
What does the passage tell us about American rivers（）

A．One sixth of them are seriously polluted.
B．One third of them arc seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
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