单项选择题

______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.

A. It is believed
B. Believing
C. Being believed
D. To believe
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单项选择题
Most of the earliest ______ into America came from Europe.
A. migrants
B. emigrants
C. immigrants
D. inhabitants
单项选择题
I Called at his house but was refused ______.
A. admission
B. access
C. reception
D. admittance
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