题目内容：
回答听力第14题__________
参考答案：
答案解析：
单选题：回答听力第14题__________
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根据以下资料回答题The United States is a democracy in that __________
根据以下资料回答题The United States is a democracy in that __________.
根据以上材料，回答第45题___________
根据以上材料，回答第45题___________
When (heat) __________, iron can be changed into liquid.
When (heat) __________, iron can be changed into liquid.
事由
事由
Tramp rates remain comparatively steady over a period of tim
Tramp rates remain comparatively steady over a period of time．（ ）