单项选择题

What does the passage mainly discuss

A．The production of solar light and heat.
B．The physical and chemical nature of life.
C．The conversion of Hydrogen to helium.
D．Radiation in the X - ray part of the spectrum.

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热门试题

单项选择题

Wilkins Micawber is a character in the novel ______, an eternal optimist who, despite evidence to the contrary, continues to have faith that something will turn up.

A．Great Expectations
B．David Copperfield
C．Oliver Twist
D．A Tale of Two Cities

单项选择题

______ is an international news agency founded in ______.

A．The Associated press; Chicago
B．Reuters; Liverpool
C．The Associated press; London
D．Reuters; New York