下列现象由地球自转产生的是[ ]
A．一年中昼夜长短的变化
B．地球上昼夜不断更替
C．一年中正午太阳高度的变化
D．一年中四季的更替
答案：B
Obviously, ______ no one wants to be alone all the time, everyone needs some degree of privacy.[ ]
A. if
B. but
C. although
D. because
大肠癌脾肾双亏证的治法是（）
A.行气散结
B.益气养阴
C.温阳益精
D.滋肾养肝
E.健脾益肾，软坚散结
