单项选择题

How often does the speaker suggest that the listeners clean out their files（）

A. At least once a month.
B. At least twice a month.
C. At least once a year.
D. At least twice a year.

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单项选择题

Which flea has been responsible for deaths（）

A. Rat flea.
B. Cat flea.
C. Dog flea.
D. Rabbit flea.

单项选择题

Which of the following is NOT a result of the undersea earthquake in Japan（）

A. At least 59 people were injured.
B. Skyscrapers in Tokyo were destroyed.
C. Power to about 17,000 homes was knocked out.
D. High-speed train service was suspended.

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How often does the speaker suggest that the listeners clean out their files（）