单项选择题

Dr. Sheeler was surprised at Mr. Nelson's call because ______.

A．the new patient should not have known his phone number
B．he seldom called at night
C．the Nelsons had been very healthy
D．the Nelsons had not called him for a long time

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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

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.