“中气下陷”主要表现为（）
A.久泻脱肛
B.腹部胀满
C.皮下出血
D.恶心呕吐
E.内脏下垂
参考答案：A, E
One of the most beautiful natural wonders in the United States must certainly be the Grand Canyon, ______ in Arizona.
A．and located
B．whose location
C．is located
D．which is located
人类历史上唯一的文理“通才”是（）
A、伽利略
B、拉斐尔
C、达芬奇
D、米开朗基罗
