单项选择题

How long may the AIDS virus lie quietly inside the body' s cells before it burst forth

A．15 years.
B．20 years.
C．30 years.
D．lifelong.
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单项选择题
What does the boy think is also important to young people
A．Doing regular checkups to prevent illness that threatens our longevity.
B．Doing crossword puzzles.
C．Doing everything in the list.
D．Doing gardening every day.
单项选择题
In order to live a longer life, what should people do
A．Do as much exercise as we can.
B．Grow flowers.
C．Drink a cup of coffee everyday.
D．Eat a balanced diet.
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