凯恩斯提出的最重要的帮助西方资本主义国家走出经济危机困境的理论是（）。
A.供需理论
B.政府干预理论
C.税收理论
D.价格理论
参考答案：B
—He got his first book published. It turned out to be a bestseller.
—When was ________?
— ________ was in 2000 when he was still in college.
A．that; This
B．this; It
C．it; This
D．that; It
胆固醇的主要代谢去路是()
A．构成生物膜
B．构成脂蛋
C．转变成胆汁酸
D．从肠道排出
E．转变成类固醇激素
