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
What of the following can be the best title for the passage
A．Bomb Hidden in a Rubbish Bin.
B．The Cause of the Explosion.
C．A Terrible Thing.
D．Market Blast Kills 1, Injures 21.
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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