He needs his homework this evening . [ ]
A . do
B. does
C. doing
D. to do
答案：A
The best way to learn English is _____ you _____ in an English-speaking environment. [ ]
A. let; live
B. to let; to live
C. letting; living
D. to let, live
苍术所含挥发油和维生素D，具有何种药理作用（）
A.抗溃疡
B.保肝
C.抗肿瘤
D.促进骨骼钙化
E.促进消化液分化
