正常人脑、肝、脂肪声衰减程度比较（）。
A.脂肪＞肝＞脑
B.肝＝脑＞脂肪
C.肝＞脂肪＞脑
D.肝＞脂肪＞脑
E.脑＞肝＞脂肪
参考答案：C
Those successful deaf dancers think that dancing is an activity sight matters more than hearing. [ ]
A．when
B． whose
C．which
D．where
假定一块土地上仅种高粱和大豆两种，那用这块地种高粱的机会成本就是种大豆可能带来的收益。
