The word "them" in line 5 refers to _____

Such(A) human activities as pollution, drainage(B) of wetlands, cutting and clearing(C) of forests, urbanization, and road and dam construction has destroyed(D) or seriously damaged available habitats.

Without(A) the particularly(B) habitat, the species could(C) not survive(D).

Chọn đáp án đúng để hoàn thành câu: 

They have built a particular reserve  which is suitable _______ pandas. 

Habitat fragmentation (A) have caused (B) plant and animal species (C) in the remaining islands of habitat to losecontact with (D) others of their own kind.

Although(A) species evolve differently, most of them adapt(B) to a specific habitat or environment that(C) best meets their survive(D) needs.

Chọn đáp án đúng để hoàn thành câu: 

When you have a small child in the house, you _______ leave small objects lyingaround. Such objects _______ be swallowed, causing serious injury or even death.

Chọn đáp án đúng để hoàn thành câu: 

We should do something immediately to conserve _______ nature.

hoàn thành câu: 

Although we are aware _______ the importance of environment, we still exploitit.   

Chọn đáp án đúng để hoàn thành câu: 

You _______ be rich to be a success. Some of the most successful people I knowhaven't got a penny to their name.

Species become extinct or endangerment(A) for a number of reasons (B), but the primary cause is the destruction(C) of habitat by human activities(D).

Chọn đáp án đúng để hoàn thành câu: 

Contamination and global warming have driven many species of animals andplants _______ the threat of extinction.

Chọn đáp án đúng để hoàn thành câu: 

If I had gone white water rafting with my friends, I _______ down the ColoradoRiver right now.  

Chọn đáp án đúng để hoàn thành câu: 

Frank's wallet is lying on the coffee table. He _______ it here last night

Chọn đáp án đúng để hoàn thành câu: 

Don't leave paraffin heaters in a draught or where they're_______.

Chọn đáp án đồng nghĩa nhất với câu sau: 

It's not necessary for you to do the test.