题目内容：
请在（4）处填上最佳答案。
A．declining B．lowering
C．improving
D．reducing
参考答案：
答案解析：
单选题：请在（4）处填上最佳答案。
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- 题目类型：单选题
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B．lowering
C．improving
D．reducing
B．lowering
C．improving
D．reducing
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