7. In the face of all these facts， it seems senseless for countries to continue destroying their rainforests.
介词短语in the face of 意思是“面对”。如：
1） They didn't give up in the face of adversity. （面对逆境，他们没有放弃。）
1）He kept his head in the face of flattery. （面对奉承，他保持镇静。）
it seems senseless for sb. to do sth. （对于某人来说做某事是愚蠢的）
1） It is important for us to get into contact with them as soon as possible.
2） It seems useless for you to argue further with him. （你再跟他争辩下去似乎是毫无意义的。）
1） It is necessary for us to continue to learn things in life. （我们在生活中不断学习是必要的。）
2） He continued doing his homework. （他继续做家庭作业。）
8. …the government often have no choice but to turn a blind eye.
have no choice but to do sth. （别无选择，只能…），如：
1） I had no choice but to take the last train to go home. （我别无选择，只能乘末班火车回家。）
2）They had no choice but to accept the term. （他们别无选择，只能接受这个条件。）
turn a blind eye （to sth.） （对…视而不见），类似的表达不有turn a deaf ear to sth.，如：
1）He turned a blind eye to the messy room （他对凌乱的房间视而不见。）
2）The manager turned a deaf ear to the customers' complaints about the poor service.
9. …which they badly need to pay off their foreign debts and purchase foreign equipment and other goods.
1） I am badly in need of advice. （我急需建议。）
2） We need the money badly. （我们非常需要这笔钱。）
pay off的意思是pay all that is owed （清偿）。如：
1） It book him 6 years to pay off the debt.（他花了六年时间才还清那笔债。）
2） He won't be able to pay off a home all his life. （他一辈子也不能付清购买住房所下的钱。）
10. …how to select trees worth exporting and to cut only those trees down while leaving the rest， so that the basic make up of the forest would not be disturbed.
1） This book is worth reading. （这本书值得一读。）
2） The equipment is worth 10，000 dollars. （这台设备值一万美元。）
1） be worth + n. = be worthy of + n.
This matter is worth consideration.
This matter is worthy of consideration.
2） be worth doing = be worthy of being done
to be done
This matter is worth considering.
This matter is worthy of being considered.
to be considered.
3） It is worthwhile doing sth.
to do sth.
It is worthwhile to consider the matter.
considering the matter.
1） He didn't know the make-up of the mineral. （他不知道这种矿物质的构成。）
2） The make-up of Chinese characters is hard for many foreigners. （对许多外国人来说汉字的构造很难。）
11. Last but not least， …
本句的意思是the last point but not the least important one （最后一点，但并不是最不重要的点。）
1. at such a rate
2. speed up
3. be located
4. be allowed to
5. according to
6. contribute to
7. derive from
8. continue doing
9. in the face of
10. continue doing
11. stop sb. from doing sth.
12. cut down
13. turn a blind eye
14. pay off
16. make a living
17. be worth doing
19. on the spot
20. in addition to
Text B life in the tundra
1. be known as
China is known as one of the four ancient civilizations.
She is known as a great singer.
2. adapt to
It is hard for him to adapt to the food and climate there.
He is well adapted to the harsh environment.
3. threat to
Heart diseases are major threats to life.
Darkness is a threat to him.
4. to some degree
I agree with you to some degree.
To some degree he hated his work.
5. as if by magic
His face turned green as if by magic.
The sun appeared after the rain as if by magic.
6. give birth to
Mrs. Brown gave birth to a baby girl last week.
The summer sun gives birth to many species of arctic plants.
7. in search of
The whole family was out in search of the lost pet dog.
All his life he has been in search of the meaning of life.
8. migrate to
Many birds migrate to the south in winter.
He migrated from Canada to the United States when he was 30.
9. in turn
We drove to the beach last week. The two of us took the wheel in turn.
Theory is based on practice and in turn serves practice.
10. result in
His carelessness resulted in the accident.
Deforestation will result in disastrous ecological changes.