举例说明藻类植物的生活史类型。

A. 内部环境
B. 信息与沟通
C. 控制活动
D. 内部监督

A. To get some data for his research in college.
B. To give his students more practice.
C. To popularize the subject of philosophy.
D. To promote philosophy to a higher level.

A. Healthy people are more likely to get married.
B. Happy people do not always get married.
C. Married people may not be in love with each other.
D. Married people don"t receive good care in old years.

A. The married.
B. The unmarried.
C. The divorced.
D. The widowed.