大气中的氧气、二氧化碳、水等物质会随着大气在全球范围内活动,不会局限在某一个生态系统,这个现象说明___________。
地球上各个生态系统之间不是孤立的,而是有着密切联系。
下列加横线字词读音全部正确的一项是:( )
A.氤氲( yūn) 濒临(pín) 下载zài 量体裁衣(liàng)
B.耄耋(dié) 怪癖(pǐ) 芟除(shān)针砭时弊(biān)
C.掣肘(zhì) 媒妁(shuò)颤栗zhàn瞠目结舌(chēng)
D.狡黠(xiá) 讣告(fù) 供求(gòng) 吹毛求疵(cī)
阅读短文,选择正确答案。
My village is very beautiful. There are many mountains near my village. There is a forest in the mountains.
It's near my village. There are many big trees in the forest. Two bridges are over the river. The river is near my
house. Look! There are many ducks and boats on the river. There are many fish in the river. I love my village
very much.
1. Where are the ducks?[ ]
A. They are on the grass.
B. They are on the river.
C. They are in the river.
2. Are there any mountains near my village? [ ]
A. Yes, there is.
B. Yes, there are.
C. No, there aren't.
3. Is there a river?[ ]
A. Yes, there are.
B. No, there isn't.
C. Yes, there is.
4. Is it a beautiful village? [ ]
A. Yes, this is.
B. Yes, there is.
C. Yes, it is.
5. Do you like the village?[ ]
A. Yes, I can.
B. Yes, I am.
C. Yes, I do.