期权的价值由（）组成。
A.市场价格
B.内在价值
C.执行价格
D.时间价值
E.收益率
参考答案：B, D
解析：期权的价值由时间价值和内在价值组成。
完成句子。
l. If your friend ______ (练习) speaking English every day, he'll learn it well.
2. It's one of the highest ______ (建筑物) in this city.
3. The young man ______ (为……而挣钱) his study.
4. Every morning Zhang Yong is ______ (最早) student in his class.
5. There is ______ (大量) rubbish information on the Internet.
脑脊液的主要功能是什么?
