消极型股票投资策略可以分为简单型和指数型两类。()
参考答案:对
Smoking is bad for your health. You'd better _____. [ ]
A. give up it
B. give it up
C. take out it
D. take it out
河蟹是()动物,偏喜食动物性饲料。
A、杂食性
B、滤食性
C、草食性
D、肉食性