单项选择题

According to the writer, why "in our over-sixty population there are ten widows for every man"

A．Men work harder than women.
B．The writer doesn't explain it clearly in the passage.
C．Men and women are not equal.
D．Men don't like to exercise.
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单项选择题
Why do scientists plan to transmit waves through the Pacific Ocean
A．To measure the effects of loud noises.
B．To take earth’s temperature.
C．To analyze the speed of sound.
D．To help the researchers.
填空题
What did Schubert’s father do
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