下列生态系统被称为“绿色水库”的是_刷题宝

题干

下列生态系统被称为“绿色水库”的是（）

A：草原生态系统

B：淡水生态系统

C：森林生态系统

D：海洋生态系统

上一题下一题 0.0难度选择题更新时间:2018-07-20 05:42:32

答案(点此获取答案解析）

C

同类题1

下图中两条虚线之间的部分表示生态系统功能正常的作用范围。y表示一个外来干扰使之偏离这一范围的大小；x表示恢复到原状态所需的时间；曲线与正常范围之间所夹的面积可以作为总稳定性的定量指标（TS）。下列说法正确的是：

同类题2

在化合物中，氧元素通常显____价，金属元素和非金属元素化合时，金属元素显____价，非金属元素显____价．在单质分子里，元素化合价为____．

同类题3

根据短文内容判断正误。

U2 is the name of a band from Ireland. It's one of the most famous rock bands in the world.

In l978, a l7-year-old high school student, Larry Mullen, looked for some musicians to make a band. Finally, he found another three boys and they set up a band. The four boys named their band U2.

They travelled a lot and gave concerts in many countries. More and more people got to know them and love their music. Many of their songs, such as Beautiful Day and Walk On, were popular. In the l980s, the band became famous.

Now the four members of U2 are still good friends and their music is still popular. People in the world still enjoy their music.

同类题4

下列关于化学反应速率的说法，不正确的是（）

同类题5

.The Chinese language differs from many Western languages___________it uses characters which have meanings and can stand alone as words.

小学学科试题库

初中学科试题库

高中学科试题库