填空题
Languages have been changed through the ages.
【参考答案】
Y
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独生子女的种种问题 2.造成这些问题的原因 3.提出你的解决方法 Hard Life Is Good for Children
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单项选择题
Judging from the context, the word they (line 2, Para.4) refer to ______.
A.the security risks
B.the terrorist attacks
C.environmental hazards of over-centralization
D.the security risks, economic expenses, and environmental hazards
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