He spent thirty minutes in finishing his homework.

A．It took him half an hour to finish his homework.

B．It takes him half an hour to finish his homework.

C．It cost him half an hour to finish his homework.

D．He spend half an hour to on finishing his homework.

肝硬化所致的肝功异常最可能出现的蛋白改变是（）

A.白蛋白40g／L，球蛋白25g／L，A／G=1.60

B.白蛋白30g／L，球蛋白30g／L，A/G=1.0

C.白蛋白60g／l，球蛋白15g／L，A／G=4.0

D.白蛋白45g／L，球蛋白39g／l，A／G=1.15

E.白蛋白37g／l，球蛋白19g／l，A／G=1.95