题目内容
50.___
A. They are too complicated.
B. She doesn't have time to talk about them today.
C. The class didn't have a chance to read about them.
D. She doesn't agree with them.
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44.___
As a drop of supercooled water.
B. As a snowflake.
C. As a particle of dust.
D. As a ball of ice.
42.___
A. To discuss a weather phenomenon.
B. To explain how to drive during storms.
C. To describe supercooled water.
D. To warn gardeners of the danger of hail.
43.___
A. Because of its size.
Because of its color.
C. Because of its layers.
D. Because of its weight.