单项选择题

Grouping stars by constellations is a handy way of mapping the sky.

A. nice
B. funny
C. manual
D. convenient
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单项选择题
Genetics is the study of the biological factors that influence heredity and determine variation in living things.
A. duplicate
B. affect
C. clarify
D. improve
单项选择题
The atmosphere, a narrow band of gases surrounding the Earth, is maintained by gravitational pull.
A. clear
B. freezing
C. thin
D. poisonous
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