单项选择题

The word "spas" (Para. 1) most probably refers to ________.

A．sports activity
B．places for physical exercise
C．recreation centers
D．athletic training programs
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单项选择题
With what topic is the second paragraph mainly concerned
A．How the Sun evolved.
B．The structure of the Sun.
C．Why scientists study the Sun.
D．The distance of the Sun from the planets.
单项选择题
According to the passage, as the corona rays reach the planets, they become ________.
A．hotter
B．clearer
C．thinner
D．stronger
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