赞题库-背景图
单项选择题

______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth
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热门试题

单项选择题The higher the standard of living and the greater the national wealth, ______.

A．the greater amount of paper is used
B．the greater is the amount of paper is used
C．the greater the amount of paper used
D．the amount of paper used is greater

单项选择题My passport is due to ______ in three months.

A．terminate
B．cease
C．expire
D．exceed