单项选择题

How long will the sucking of the mosquito last().

A. Less than 8 seconds.
B. No more than 12 seconds.
C. 8 to 10 seconds.
D. About 5 seconds.

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Which of the following is NOT the purpose of the summit
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B. To mark the anniversary of Non-aligned Movement.
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All the following statements are true about the refugees EXCEPT that
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B. the internationally recognized standard of water supply is 15 liters a day
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D. an urgent search for alternative supplies will be conducted for them
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