Is the world warming up? According to many reports the answer is yes．Eleven of the hottest years since 1850 appeared between 1995 and 2006．Last year, the United Nation’s Intergovernmental Panel on Climate Change(IPCC)reported the earth was about 0.75℃warmer than it was in 1850．While this doesn’t sound like a lot, a small difference in average(平均)temperature can make a big difference in climate(气候)．During the last ice age, the planet was only about five degrees colder than now．
It’s all about the speed at which temperatures are changing．In the past, temperatures moved up or down step by step．But in the 20th century, especially since 1976, temperatures have likely risen more quickly than during any century in the last 1,000 years．Warming may bring improved harvests(收获)to northern countries such as Canada and Russia．However, many species(物种)won’t like these conditions．They begin moving towards cooler places and cause lots of trouble to human world．
The IPCC reported that human activity is very likely responsible(负责任的), by increasing the greenhouse effect(效应)．Some gases cause the air to take in heat energy．Without the greenhouse effect, the earth’s average temperature would be -18℃ rather than the present comfortable 14.6 degrees．The main greenhouse gases are carbon dioxide(CO2), water vapor(蒸汽)and some other gases．Burning oil, coal and waste adds to the Carbon dioxide, and it has increased 35％since 1850．
Many researchers have found that natural forces alone don’t explain the temperature increases over the last 30 to 40 years．Their study shows that as carbon dioxide goes up, temperatures will rise too．But some scientists don’t agree．They think the effect of human produced greenhouse gases is very small compared to the normal changes that the climate causes．
When asked whether humans are causing the world warming, Carl Wunsch, a professor at the Massachusetts Institute of Technology says,“It seems very likely from what I’ve seen．Is it 100％sure?No．There’s something to do with natural changes．”Does that mean we should have a“wait and see”attitude(态度)?Not according to Wunsch．He points out we buy house insurance(保险)not because we are sure our homes will be on fire, but because it’s a danger we’d rather avoid．
(1)
The writer’s purpose here is ________．
[ ]
A．
to introduce a scientific study
B．
to report a serious problem
C．
to teach an important subject
D．
to describe an unusual fact
(2)
What’s the earth’s average temperature in 1850?
[ ]
A．
0.75℃．
B．
-18℃．
C．
14.6℃．
D．
13.85℃．
(3)
Which of the following is responsible for the earth’s warming up?
A：Thanks a lot．Here is the change (找的零钱) for you．Do you need a bag?
B：Yes，please．
A：Here you are．
B：Thank you very much．
A：Thank you，too．
(1)
The customer wants ______．
A．to get a discount (折扣)
B．to use a credit card
C．one bag for each item
D．to pay with a check (支票)
[ ]
(2)
How much does the cashier give the customer?
A．￥20．00． B．￥10．50． C．￥10．00． D．￥6．50．
[ ]
(3)
The tax is ______．
A．less than a dollar
B．10% of the total
C．fifty dollars
D．more than a price of a notebook
[ ]
(4)
“Here you are．” is the same as“______”．
A．This is for me．
B．Please leave．
C．This is your bag．
D．The door is over there．
[ ]
(5)
Which of these sentences is true?
A．The store doesn't have any bags．
B．A tape costs more than a pen．
C．The person buys six things．
D．The store doesn't take credit cards．
[ ]
阅读理解
You will have a lot of reading to do in this grade this year．You can do more of it in less time if you learn to read rapidly．
Perhaps you have been told about some habits (习惯) which keep a person from reading fast and have been strongly asked to break those habits which you might have．
Do you still have any of these bad habits?Check yourself by answering“yes”or“no”to these questions．
(1) Do you move your lips (嘴唇) when reading silently?
(2) Do you point to words with your finger as you read?
(3)Do you move your head from side to side as you read?
(4)Do you read one word at a time?
If you answer“yes”to any of these questions,start at once to break the habit．If you move your tips，hold your fingers over them，or hold a piece of paper be-tween your lips while you are reading．Then if your lips move，your will know it and can stop them．
If you point to words，hold the two sides of your book，one side with your left hand，the other side with your right hand．Then you won't have a free finger to use in pointing while reading．If you move your head，place your chin (下巴) in one hand and hold your head still (静止不动的)．
If you read no more than one or two or three words at a time，you need to work very hard in learning to take in (吸收) more words at each glance (一瞥) as your eyes travel across the lines of words．
Even if you do rather fast now，you can learn to read even faster．As you probably have been told，the secret of fast reading is to take in whole groups of words as each glance．Read in through groups and force (迫使) your eyes along the lines of words as fast as you can to make them go．Anyone who practices doing these things will he able to read faster．
(1)
You may hold your fingers over your lips while reading so as ______．
A．to tell others to be silent
B．to feel whether your lips move or not
C．to hold a piece of paper between them
D．to keep yourself from talking to others
[ ]
(2)
When you read，______．
A．don't keep your head still
B．don't hold your books with your hands
C．don't stand up near a desk
D．don't use your finger to point to words
[ ]
(3)
If you learn to read fast，______．
A．you can read more in less time
B．you can write faster
C．you can understand better
D．you can read less in more time
[ ]
(4)
You must _______ those habits that we are talking about in this reading．
