Saving the earth
suggested answer is for farmers to limit the numbers of their cattle.
limit vt. 限制
1) We must limit our spending. 我们必须限制我们的开销。
2) Mother limits us to eat one cake each. 母亲限制我们只能一人一块蛋糕。
n. 限制
3) The speed limit within the city is 35 miles per hour. 在城市里的限速是每小时35英里。
7. When trees are cut down, there is nothing to hold the soil in place on the hillside.
place in place 在原处
1) She likes everything to be in place. 她喜欢将每种东西放回原处。
2) I hope you will keep the books in place. 我希望你将书放回原处。
in place of somebody:代替某人
3) Will you go in place of me?你是否代替我去？
take place:发生
4) A car accident took place yesterday. 昨天发生了一起车祸。
take the place of somebody:代替某人
5) I’ll take the place of Mr. Wang. 我将代替王先生的位置。
take one’s place:接替某人
6) I’ll take Mr. Wang’s place. 我将接替王先生。
8. However, many of these are dying out.
die out vi.（火）熄灭
1) The fire died out at last. 最后火还是熄灭了。
vi. 绝种
2) This kind of bird is dying out, and we must protect them. 这种鸟类已经正在灭绝，我们应该保护他们。
9. The purpose of the trip was to record all the wildlife and plants that we could find in the forest.
Purpose n. 目的， 通常是可数名词。目的是什么 用介词for.
1) What was the purpose of his visit? 他来访的目的是什么？
2) He came to Beijing for business purpose. 他来北京是有商业目的的。
on purpose: 专门
3) I had no doubt that she did this thing on purpose. 我毫不怀疑她做这件事是有目的的。
10. In the afternoon, we all went off separately to look for new plants.
Go off 动词短语
走开
1) She got angry and went off after she heard what I said. 听到我所说的她一生气离开了。
响起巨大的声音
2) Although the clock went off, he didn’t wake up.尽管闹钟暴响， 他仍然没有起来。
熄灭
3) The lights went off suddenly. 灯突然地熄灭了。
腐败
4) “The milk has gone off .” my mother said, “ and don’t drink it!” 妈妈说道：“别喝那牛奶了，它已经坏了。”
11. He was busy measuring a plant and taking photographs of it.
Be busy doing, keep busy doing sth. 忙于做某事。
We are busy making preparations for the coming exam. 我们正在忙于为即将来到的考试做准备。
measure vt. 测量
1) The policeman measured the speed of the car. 警察测量车速。
vt. 有……的长度，相当于系动词。
2) The room measures 6m long. 这间房子有六米长。
n.计量单位
3) The meter is a measure of length. 米是一种计量单位。
take the measure of something:测量某物的长度
4) I take the measure of the desk following the teacher’s instructions. 我遵循老师的指令测量桌子。
n.手段、方式
5）They took a strong measure to deal with the workers.他们采取了强硬的手段来对付工人。
12. 分词作为形容词时， A. 及物动词中现在分词表示主动，和动作正在进行；过去分词表示被动或动作已完成。 B. 不及物动词中现在分词表示动作在进行，过去分词表示已完成。
例如：A:
There are many wounded soldiers in the battlefield.
My spoken English has greatly improved.
Don’t sit in that broken chair. It’s dangerous.
She is a leading figure in the Party.
Barking dogs seldom bite.
B:
The risen sun, fallen leaves, retired workers, escaped prisoner , a rolling stone, boiling water, boiled water.
另外还有一些假过去分词。如 1)“adj-noun-ed” a warm-hearted man. 2) “数词-noun-ed” The one-eyed man is hiding behind the door. 3) “数词-度量衡名称” a twenty-cent book
分词作表语， 现在分词表示主动正在进行， 过去分词作表语表示被动已经完成。
The day was so charming! The news is encouraging.
The door remained locked. He seemed quite delighted at the idea. The room was packed with people.
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《Saving the earth(第2页)》
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limit vt. 限制
1) We must limit our spending. 我们必须限制我们的开销。
2) Mother limits us to eat one cake each. 母亲限制我们只能一人一块蛋糕。
n. 限制
3) The speed limit within the city is 35 miles per hour. 在城市里的限速是每小时35英里。
7. When trees are cut down, there is nothing to hold the soil in place on the hillside.
place in place 在原处
1) She likes everything to be in place. 她喜欢将每种东西放回原处。
2) I hope you will keep the books in place. 我希望你将书放回原处。
in place of somebody:代替某人
3) Will you go in place of me?你是否代替我去？
take place:发生
4) A car accident took place yesterday. 昨天发生了一起车祸。
take the place of somebody:代替某人
5) I’ll take the place of Mr. Wang. 我将代替王先生的位置。
take one’s place:接替某人
6) I’ll take Mr. Wang’s place. 我将接替王先生。
8. However, many of these are dying out.
die out vi.（火）熄灭
1) The fire died out at last. 最后火还是熄灭了。
vi. 绝种
2) This kind of bird is dying out, and we must protect them. 这种鸟类已经正在灭绝，我们应该保护他们。
9. The purpose of the trip was to record all the wildlife and plants that we could find in the forest.
Purpose n. 目的， 通常是可数名词。目的是什么 用介词for.
1) What was the purpose of his visit? 他来访的目的是什么？
2) He came to Beijing for business purpose. 他来北京是有商业目的的。
on purpose: 专门
3) I had no doubt that she did this thing on purpose. 我毫不怀疑她做这件事是有目的的。
10. In the afternoon, we all went off separately to look for new plants.
Go off 动词短语
走开
1) She got angry and went off after she heard what I said. 听到我所说的她一生气离开了。
响起巨大的声音
2) Although the clock went off, he didn’t wake up.尽管闹钟暴响， 他仍然没有起来。
熄灭
3) The lights went off suddenly. 灯突然地熄灭了。
腐败
4) “The milk has gone off .” my mother said, “ and don’t drink it!” 妈妈说道：“别喝那牛奶了，它已经坏了。”
11. He was busy measuring a plant and taking photographs of it.
Be busy doing, keep busy doing sth. 忙于做某事。
We are busy making preparations for the coming exam. 我们正在忙于为即将来到的考试做准备。
measure vt. 测量
1) The policeman measured the speed of the car. 警察测量车速。
vt. 有……的长度，相当于系动词。
2) The room measures 6m long. 这间房子有六米长。
n.计量单位
3) The meter is a measure of length. 米是一种计量单位。
take the measure of something:测量某物的长度
4) I take the measure of the desk following the teacher’s instructions. 我遵循老师的指令测量桌子。
n.手段、方式
5）They took a strong measure to deal with the workers.他们采取了强硬的手段来对付工人。
12. 分词作为形容词时， A. 及物动词中现在分词表示主动，和动作正在进行；过去分词表示被动或动作已完成。 B. 不及物动词中现在分词表示动作在进行，过去分词表示已完成。
例如：A:
There are many wounded soldiers in the battlefield.
My spoken English has greatly improved.
Don’t sit in that broken chair. It’s dangerous.
She is a leading figure in the Party.
Barking dogs seldom bite.
B:
The risen sun, fallen leaves, retired workers, escaped prisoner , a rolling stone, boiling water, boiled water.
另外还有一些假过去分词。如 1)“adj-noun-ed” a warm-hearted man. 2) “数词-noun-ed” The one-eyed man is hiding behind the door. 3) “数词-度量衡名称” a twenty-cent book
分词作表语， 现在分词表示主动正在进行， 过去分词作表语表示被动已经完成。
The day was so charming! The news is encouraging.
The door remained locked. He seemed quite delighted at the idea. The room was packed with people.
第 1 2 3 页
《Saving the earth(第2页)》
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