江苏成人高考-成人学历教育-无锡学历提升2022年成人高考英语历年真题及解析( 三 ) _his

Rivers covered in ice can also lead to flooding.When ice begins to melt ， it breaks into large pieces. These pieces of ice move and float down the river.They can block the river ， causing the water to rise and flood the land up the river.If the iced am(坝) breaks suddenly ， the large quantity of water held behind it can flood the areas down the river too.
Broken ice dams are not the only problem that can cause flooding.When a large human-made dam breaks or fails to hold the water collected behind it ， it will also cause serious damage.
Although scientists can not always know when floods will occur ， they do know a great deal about when floods are likely ， or probably ， going to occur.
40.What have scientists achieved in dealing with floods?
A.They have prevented many rivers from flooding.
B.They have reduced the damage caused by floods.
C.They have learned much about conditions for flooding.
D.They have found most of the ice damson the river.
41.When will deep snow lead to floods?.
A.The snow suddenly gets frozen.
B.The top of the ground becomes wet.
C.I trains hard with a big rise in temperature.
D.The snow melt s gradually into a river.
42.What happens when ice dams break?
A.They may quickly block the river.
B.The ice covering the river may melt fast.
C.A larger iced am may soon be formed.
D.The areas down the river maybe flooded.
C
It was Sharing Day!The teacher had asked the students to bring something interesting to class.
Jimmy found the little box he and Dad had made.Inside was apiece of rock ， as and dollar and a shark(鲨鱼) tooth.Nobody could have anything as interesting as these!
In class ， Jimmy waited anxiously ， hoping to be called on first by the teacher.But Kara was first.She held up as and dollar.Jimmy's eyes grew big.
“I found this on the beach ， ”Kara said.“It's interesting.The little holes that make the sand dollar look like a flower are breathing holes.See all the needles?They help the sand dollar move and dig into the sand.”
Jimmy was a little uneasy.Oh ， well ， he still had his rock and shark tooth.
Then Mark stood up.“This is my favorite rock ， called pumice(浮石) .”Then Mark dropped the rock into a glass of water.“Look!Pumice is the only rock that floats!”
Jimmy put up his hand and waved ， but the teacher called on Justin instead.“I found this shark tooth in Hawaii last Christmas ， ”Justin said.
The class was excited ， but Jimmy lowered his head.“Sharks have rows of teeth.Every time a shark loses a tooth ， another one takes its place.”Justin passed the tooth around.Jimmy heard the teacher call him.He stood on one foot and then the other.“Well ， ah ， see...my treasure box is interesting!It was just apiece of wood until Dad and I cut it into pieces and finally made a box out of it.It smells good ， reminding us of camping.
“What's inside?”asked Lisa.
Jimmy opened his box.“As and dollar ， apiece of pumice and a shark tooth.”
His classmates' mouths dropped open.The teacher looked at the objects in the box and smiled.“Now that's interesting!”he said.
43.On the Sharing Day ， Jimmy___
A.bought a treasure box to hold his interesting things
B.enjoyed the things others brought to the class
C.waited patiently to be called on by his teacher
D.wished to be the first to share his possessions
44.What does as and dollar look like according to Kara?
A.A hole. B.A needle. C.A flower. D.A tooth.
45.Who shared with the class a rock that floats?
A.Lisa. B.Kara. C.Justin. D.Mark.
46.How did Jimmy's classmates feel when they saw the things in his box?

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