单项选择题

The proper title for this passage would be ______.

A．Rat the Cleverest
B．The Largest Grain Eater
C．Our Most Dangerous Enemy the Rat
D．The Dangerous Diseases Carrier
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单项选择题
Why had there been no calls from the Nelsons for quite some time
A．Mrs. Nelson's appendix had been taken out two years before.
B．Mr. Nelson had divorced his wife and had married another woman.
C．Mr. Nelson had decided not to bother the doctor any more.
D．Mr. Nelson's former wife had been very well recently.
单项选择题
Rats are clever enough to ______.
A．know when food has got poison in it
B．have good leaders and tell them what to do
C．eat food that is dangerous
D．kill men who try to kill them
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