What caused the accident?
是什么引起这个事故的？
cause 用作名词，意为“原因，理由”。例如：
Carelessness is the usual cause of fire.
造成火灾的原因通常是不谨慎。
cause 是造成一种事实或现象的“原因”，
Heat is the cause of the expansion of matter.热是物体膨胀的原因。
reason 是说明一种看法或行为的“理由”。例如：
You must tell him the reason why you won’t accept his
《Unit 12 Mainly Revision》出自：www.89xue.com网www.89xue.com offer.
你必须告诉他你为何拒绝他的提议。
3.deep, deeply
deep可作形容词，表示“深的”，又可作副词，表示“深深地”。这里是具体意义的“深”。
The river is very deep here. (deep是形容词)
He pushed his stick deep into the mud. (deep是副词)
在一些固定的搭配中使用deep, 尤其在介词词组前。如：
be deep in debt 债台高筑
be deep in thought 深入沉思
do sth. deep into the night 一直做到深夜
deeply是deep后缀-ly构成副词, 使用时一般具有抽象含义，意为“深深地，深厚地，深切地”。如：
We are deeply grateful for your help. 我们非常感谢你的帮助。
4.fly away 与fly off
1）它们俩都可表示“匆匆离去（飞去）”之意，但有一些差别。fly away距离较远，而fly off指距离较近。
Then they flew away into their hiding place.
后来他们窜回到他们躲藏的地方去了。
When he was driving very fast, one of the wheels of his wagon flew off.
他正把车开得飞快，一只轮子突然脱落了。
2）away是副词，off既可作副词，也可作介词。off后可跟宾语，away后则不可。如：
The bird shook its tail and flew away. 那只鸟摇着尾巴飞走了。
【注意】把动词keep, run, walk, move等后面加上away或off, 其区别与上述所谈类似。如：
What kept you away last Sunday? 上星期日你为什么没来？
Keep off the grass! 勿踏草地！
Lesson 46 教学设计方案（一）
Step 1 Lead – in
(Show some pictures to attract the Ss’ interests about the text.)
Step 2 Reading:
A.Ask the Ss to do some “True or False” exercises
1. Some birds will fly away to the south when the weather turns cold; some animals hibernate in the cold wather.(True)
2. Animals hibernate only in the earth. (False)
3. None of the warm-blooded animals need to hibernate because they lead an active life which keeps up their normal body temperature even in very cold weather. (True)
4. A hibernating animal does not breathe and cannot feel any pain. (False)
B.Questions and answers:
1. Why don’t some warm-blooded animals hibernate in the winter?
(lead an active life, keep up, normal body temperature)
2. Why do cold-blooded animals hibernate?
(When the air temperature, below freezing, body temperature, drop, cannot move about; almost no food in the winter)
3. How would you recognize that an animal is hibernating?
C.Reading comprehension:
1.The text mainly tells us that ________.
A .hibernation is more than sleep
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