单项选择题

This article concludes that_________ contribute to the remarkable long life of these peoples.

A．moderate diets
B．clean mountain air
C．daily hard work
D．all the above factors
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单项选择题
How much of the earth's water can man really use
A．He can use nearly 75% of it.
B．He can use about 97% of it.
C．He can use less than 3% of it.
D．He can use exactly 3% of it.
单项选择题
For whom the short term insurance program is NOT ideal
A．Underemployed people.
B．Unemployed people.
C．Part－time jobholders.
D．Graduating students.
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