单项选择题

In the last paragraph the underlined word "speculate" probably means ______.

A．tell
B．guess
C．discuss
D．talk
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单项选择题
It can be inferred from the passage that ______.
A．all the injured were taken to a hospital
B．8 of the injured were not taken to a hospital
C．the rubbish bin with a bomb was in a restaurant
D．the rubbish bin with a bomb was in a shop
单项选择题
From the passage, we know that man must ______.
A．do nothing to keep the balance (平衡)of nature
B．try his best to change the balance of nature
C．try his best to keep the balance of nature
D．do his best to stop the balance of nature
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