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【参考答案】

“before”改为“ago”
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单项选择题
It can be inferred from the passage that the Sun’s light travels
A．through solid objects in space
B．in many different directions
C．more slowly than scientists previously believed
D．further in summer than in winter
单项选择题
What is one thing the members of the co - up must do
A．Avoid junk food.
B．Attend monthly meetings.
C．Buy cleaning supplies at the co - up.
D．Work at the co - up.
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