单项选择题

What is the talk mainly about

A．Differences between the planets in the solar system.
B．Methods of determining the composition of Earth and the Moon.
C．Why Earth has an iron core.
D．The origin of the Moon.

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热门试题

单项选择题

A chief factor in bringing down the births in Europe in the 19th century is

A．birth control
B．the desire to seek fortune in cities
C．the instability of marriage
D．the changed place of women

单项选择题

Why doesn't the man want to change his work schedule

A．All the other work schedules conflict with his classes.
B．He doesn't want to ask his boss for another favor.
C．He wants to work the same schedule as his friends.
D．He likes to do his homework in the evenin