正确答案:

题目：随着生态演替的发展，正相互作用增加负相互作用减少。（ ）

解析：√

查看原题查看所有试题

学习资料的答案和解析：

[单选题]Mathew Brady______.

was famous for his unusual pictures

解析：

39．答案为B  根据第四段“The pictures were unusual because they were very lifelike．”可知 Mathew Brady拍的照片栩栩如生，因此而闻名。

[单选题]Not until I got to the railway station ______my ticket missing.

did I find

解析：6．答案为B  我到火车站才发现车票没了。not until置句首时，主句主谓倒装，可排除A、

[单选题]不开口于中鼻道的鼻旁窦是（ ）

筛窦后群