13．I have had a cold for more than a week．Howlong have you had a cold?——青夏教育精英家教网——

13．I have had a cold for more than a week．（对划线部分提问）
Howlong have you had a cold？

12．I don't know how I can run the machine．（改为同义句）
I don't knowhowto run the machine．

11．The dog died two days ago．（改为同义句）
The dog hasbeendead for two days．

10．His hometown was a small and poor town in the past．（改为同义句）
His hometownusedto be a small and poor town．

9．Protecting theenvironment（环境） is our duty．

8．Why do plants grow in some places and not in the others？Why does some land have so much growing on it，while other land has almost no plants growing on it at all？
To grow，plants need several things．One is warmth．In very cold places almost nothing grows．Plants also need water．In very dry parts of the Earth only a few unusual plants can grow．That's why dry deserts everywhere are almost not covered by trees or grass．
Plants must also have a place in which to put down their roots and grow．They find it difficult to grow on hard land．The town is built on hard land．The plants here have only the soil found between the cracks of the stones to grow in．
Another thing plants must have before they can grow is food．
What will happen if we try to make things grow on the sandy beach？A few plants，such as beach grass，will grow in sand，but most plants won't．Even if the weather is warm enough and we water the plants each day，many of them will die because the sand on this beach has almost no food for plants．

48．What does the underlined word"cracks"mean in the text？A
A．缝隙                 B．表面                  C．夹层                   D．底部
49．The reason why most plants can't grow on the sandy beach is thatD．
A．there isn't enough sunlight                  B．there is too much water
C．it is too crowded there                       D．it has little food for plants
50．The passage can most probably be found in aA book．
A．science               B．history                C．travel                  D．maths．

7．Peter is muchheavier than before．（heavy）

6．Yesterday when I ____ my room，my aunt ____．（　　）

	A．	was cleaning； was arriving		B．	cleaned； reached
	C．	was cleaning； arrived		D．	cleaned； was arriving

5．---How does Jack usually go to work？
---He used to drive a car，but now he ____ there to lose weight．（　　）

	A．	is used to walk		B．	used to walk
	C．	used to be walking		D．	is used to walking

4．Jimmy can't buy any new books because he has ____ his money．（　　）

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