题目内容

The main reason for this is that people are living a happier life.

A. difficult
B. necessary
C. simple
D. chief

查看答案

搜索结果不匹配？点我反馈

更多问题

Many buildings for 2010 Expo have already been built in shanghai.

A. put up
B. missed
C. improved
D. memorized

Since you are overweight, you'd better go on a diet and have more exercise.

A. Given
B. Heard from
C. Now that
D. Started

纤维分解菌与自生固氮菌之间由于前者为后者提供碳源，后者为前者提供氮源而构成（）

A. 偏利共栖关系
B. 互利共栖关系
C. 共生关系
D. 寄生关系

土壤中微生物种类含量最多的是（）

A. 细菌
B. 霉菌
C. 酵母菌
D. 放线菌