Farmer Ed Rawlings smiles as he looks at his orange trees．The young oranges are growing well in Florida’s weather．Warm sunshine and gentle rains, along with Ed Rawlings’ expert care, will produce a good crop(收成)of oranges this year．
However, Ed has to guard against Florida’s changeable winter weather．In January and February, temperatures can destroy Ed’s entire orange crop．Having farmed in Florida for the past 35 years, Ed is prepared for the frost(霜)．When temperatures drop below freezing, Ed tries to save his crop by watering his orange trees．The water freezes and forms a thin layer(层)of ice around the trees．Strange as it may sound, this thin layer of ice actually keeps the fruit warm．
What happens is simple．When the trees are watered, the water loses heat and becomes ice．The warmth of the heat it loses is taken in by the fruit and keeps its temperature at a safe level．Ed has effectively used this method to save many orange crops．
But Ed still faces difficulties．The trees must be watered at the exact moment the temperature drops to the freezing point．Also, just the right quantity(数量)of water must be used．Too much water can form a thicker layer of ice that will break the tree’s branches(树枝)．Another difficulty is that wind blows away the heat, so Ed has to worry about not only when but also how often his trees should be watered, and how much water should be used．
Computer technology may help Ed with some of these worries．With equipment(设备), air and soil temperatures and wind speed can be measured．The information is fed into a computer which can calculate(计算)when the temperature will drop below freezing．The computer can correctly decide the quantity of water to be used and how frequently()the trees should be watered．Ed finds looking after his orange trees a lot easier with the help of a computer, and, his customers will have the benefits(利益)of computer-age oranges．
(1)
The passage is mainly about ________．
[ ]
A．
a farmer expert cares for his orange trees
B．
the different uses of computers
C．
growing oranges in Florida’s changeable weather
D．
different ways of frost protection
(2)
Ed tries to protect his crop by ________．
[ ]
A．
using a wind machine to drive away the cold air
B．
equipping his orange trees with a computer
C．
watering it at the proper time
D．
picking his fruit at the first sign of frost
(3)
According to the passage, the computer technology ________．
After spending years searching for a planet with life, scientists may have found one．In September 2010, a team of US scientists discovered an Earth-sized planet called Gliese 581 g．It has a surface temperature neither too hot nor too cold for liquid(液态)water．Scientists think there is a chance that the planet could have life．
The planet Gliese 581 g goes around a star called Gliese 581, which is about 20 light-years from Earth．That is about 194 trillion(万亿)kilometres－500 million times farther away from us than the moon．
A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years．A human can’t live that long, but robotic explorers could make the job easier．However, our fastest spacecraft don’t come anywhere near that one-tenth light-speed mark．
At present, scientists don’t know what the surface might be like on Gliese 581 g．What they know is that the planet is at the sight distance from its star to have liquid water．It’s also at the right distance to have an atmosphere that could protect the water if it is on the surface．
Although spacecraft won’t be getting there anytime soon, one way to look for life on Gliese 581g is to turn our radio telescopes(望远镜)towards the planet and search for radiation(放射)．By studying the radiation, scientists would find out about the chemicals(化学物质)around the planet and discover it Gliese 581 g has an atmosphere．If it has one, studying the atmosphere would give us a good idea if the planet has life or not．But it’ll probably be many years before we can do this properly．
People have been arguing about whether there is alien life on Gliese 581 g．Any discussion about alien life is just guessing at this point, according to its discoverers．
(1)
What did scientists find in September 2010?
[ ]
A．
A planet with water．
B．
A planet similar to the earth．
C．
A planet without life．
D．
A planet near the earth．
(2)
According to the article, Gliese 581 g _________．
[ ]
A．
is at the right distance from its star
B．
moves around the earth
C．
is as far away from us as the moon
D．
can be reached in about 220 years
(3)
Paragraph 5 is mainly about _________．
[ ]
A．
the possibility of living on Gliese 581 g
B．
the kinds of chemicals around Gliese 581 g
C．
the way of looking for life on Gliese 581 g
D．
the aim of studying the radiation on Gliese 581 g
(4)
Which of the following is the best title for the passage above?
[ ]
A．
Gliese 581 g, a Likely Living Planet
B．
Gliese 581 g, a Likely Living Planet
C．
Gliese 581 g and Its Star
D．
Gliese 581 g and Radiation
(阅读理解)
One day an American went to a small town in South America for his holiday.
Few people went there because it was far away from the cities．He felt ill(生病) and wanted to see a doctor very much．
The American went to find out how he could find a fine doctor there．A man told him，“That's very easy．If there is a patient(病人) that a doctor can't cure(治愈)，the doctor has to put a balloon over his clinic(诊所)．”
The American thought，“The fewer balloons there are，the finer the doctor is．”He began to look for the finest doctor along the street．First he found a clinic.There were 20 balloons．After a few minutes he found another one?0 balloons.He thought neither doctor was fine．
At last he found the third clinic．Only 5 balloons were there．He was very happy and went in．
“Wait a minute，”said the doctor，“I'm too busy，you know．This clinic opened only yesterday．”The American was very surprised(感到吃惊) and said to himself， “Where can I find the finest doctor?”
(1)
_____ went to the small town for the holiday．
A．Few people
B．No one
C．Everyone
D．A lot of people
[ ]
(2)
The American wanted to see a doctor because _____ ．
A．he didn't feel well
B．he was very happy
C．he was very tired
D．his leg was hurt
[ ]
(3)
There were _____ balloons over the second clinic than the first one．
