题目内容：
回答第63空。
A．A as B．B on
C．C by
D．D in
参考答案：
答案解析：
单选题：回答第63空。
- 题目分类：理工类
- 题目类型：单选题
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B．B on
C．C by
D．D in
B．B on
C．C by
D．D in
回答第54空。
回答第54空。A．A program B．B instruction C．C system D．D function
Scientists counted the number of stars___________．（ ）
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From the second paragraph, we know that __________.
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