单项选择题

What is the main idea of the passage

A．All senses have their limitations.
B．Insects are more sensitive to colour than man.
C．Man has not fully utilized all his senses.
D．Man is not as good as animals in learning about the environment.

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Which of the following is closed in meaning to the phra...

单项选择题Which of the following is closed in meaning to the phrase "leveled off"( Para, 2)

A．Become very popular.
B．Stopped being popular.
C．Reached its lowest level in popularity.
D．Stopped increasing in popularity.

Which of the following would be the best TITLE for the ...

单项选择题Which of the following would be the best TITLE for the passage

A．Different Forms of Exercise.
B．Exercise--The Road to Health.
C．Scientific Evidence of Health Benefits.
D．Running--A Popular Form of Sport.

According to the passage, what was the percentage of Am...

单项选择题According to the passage, what was the percentage of American adults doing regular physical exercises two years ago

A．About 70%.
B．Nearly 60%.
C．Almost 50%.
D．More than 12%.