摘要:28. isn’t easy in a new neighborhood. A.That; live B.This; live C.It; to live D.It; live

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Railroad tracks(轨道)are owned by the railroad company.This means that you may not play, walk,skate or ride a bike on the railroad.It is also unsafe.

There are places where the railroad tracks crosses roads or streets.Maw of these railroad crossings are marked with one of the following signs(标牌).

This sign means you are coming to a railroad crossing. Always look both ways and listen carefully to be sure a train is not coming from either direction  before crossing the tracks.

Many railroad crossing have a gate with flashing lights that close when a train is coming.

NEVER go around a closed railroad gate.

NEVER try to get across the tracks before the train gets there

Some crossings, which don’t have gates, may have this sign. When the lights are flashing, a train is coming, You should wait until the trains have passed before trying to cross the tracks.

Pay attention when crossing railroad tracks:

●  Railroad tracks are uneven(不平的).You should not try to take a bike or run when crossing tracks.

●Trains are very large and heavy, and take a long time to stop.

●Sometimes when a train has just passed from one direction,another train may be coming from the opposite direction.You might not notice the second train because of the noise from the first train.

1.We should__________ when we see sin1

A.go past the railway crossing as quick]Y as possible   

B.stop to wait for a train to pass。

C.make sure a train is not coming before crossing      

D.sit down to have a rest

2.The underlined word“ direction” means_______

A.说明    B.方向    C.前方    D.信号灯

3.Which of the following is TRUE?

A.GO across the railroad tracks after a train has just passed

B.It isn’t easy for a train to stop during its moving.

C.When the lights are flashing.people can cross the tracks.

D.You can’t not play on the railroad just because it is owned by the railroad company .

4.What can we learn from the passage?

A.We Call see lots of railway signs in our City.

B.Since the gate of the railroad crossing is closed.We can cross it at any time

C.It’s right to stop until we go near the train.

D.It is very dangerous for us to play, run or ride a bike on the railroad.

5.What is the best title of the passage?

    A.How to Cross the Railroad Tracks Safely     B.Pay Attention to Some Signs

    C.Don’t Play on the Railroad Tracks           D.How to Protect the Railroad Tracks

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There are about 80,000,000 mines*  under the ground in more . than 60 countries. It is difficult and dangerous to clear these rnines, About 50  people including many children were’ killed ‘or htirt each iay.  In 2003,  APOPO,  a Dutch research com pan y that uains the an imals, came up with the-idea of s\ng rats to search for the mines.
The animal trainers ‘found that a kind of rats from Africa were clever and had.a sharp*  sense of smell.  The rats were about 75 cm long and.weighed about l.35 kg, light enough to run across a minefield without setting off the mines.
In January 2004, the APOPO started this project. First, the trainers let the 4-week-old baby rats get familiar with humans. A few weeks later, the rats were no Ionger afraid of people and ‘the things around them. Then they were trained to connect a click* sound with food. After the rats had leamed that, the trainers then taught them to tell the difference between the smell of mines and other smells. When the rats could do it, the click was sounded and they were given a bit of banana.  The method was called clicker training. “The training isn’t easy, said trainer Abdullah Mchomvu.  “You have to be patient. Sometimes I get angry, but then again, I tell myself these are animals.”
After nine months’training, the rats were taken to a minefield. They’ran across the minefield, stopped, sat and scratched the ground to tell the deminers*  that they smelt out’a mine.  Then the mine was cleared. It had  taken two ‘deminers  a day to clear a 200㎡ . minefield, but with the help of two rats ‘they could finish it in two hours.
The rats and the deminers saved thousands of lives, “The rats did this job much better than we expected. So far they have helped to make almost 2,000,000㎡ of land safe. They are heroes,” said Bart Weeqens, the head of the APOPO.
【小题1】 The APOPO trained the rats to search for     .

A.childrenB.animalsC.minesD.bananas
【小题2】 While training the rats, the trainers have to be
A.patientB.cleverC.braveD.serious
【小题3】 How long did the training last?
A.Two hours.B.One day.C.Four weeks.D.Nine months.
【小题4】Which of the following is NOT TRUE according to the passage?
A.Each day about 200 people were killed or hurt by mines,
B.The APOPO started to train the rats in January 2004.
C.The trainers gave the rats food after they smelt out a mine.
D.The rats and the deminers saved thousands of lives.

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