| light moths | darker moths |
Moths set free | 201 | 601 |
moths recaptured | 34(16%) | 206(34%) |
A.it itself liked to |
B.it could be like the colour of its living-place |
C.it had to keep the balance of nature |
D.it was usually dark brown |
A.many more of the light moths were killed or eaten |
B.more than one-fifth of the light moths was not killed |
C.three times as many dark moths were kept safe as light ones |
D.more dark moths were killed in industrial areas |
A.the number of the light moths became larger |
B.the total number of the light moths remained unchanged |
C.there were more of the darker moths and fewer of the light ones |
D.the darker moths changed into the light ones suddenly |
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Dust storms are violent and mostly unpredictable. They can cause property damage, injuries, and deaths, so it’s necessary to know what to do when you come across them.
Watch out for dust storm warnings. Dust storms are most likely to occur on hot summer days, so listen to the local TV or radio broadcasts before traveling in hot, dry conditions, and consider changing or giving up your trip if dust storms are predicted. Roadside signs may also be able to warn you of dust storm danger.
Be prepared. If you are in a storm-prone area, carry a mask(
口罩) to keep out small dust particles (顆粒), and take eye protection to protect your eyes. A supply of water is also necessary.
Go beyond the storm. If you see a dust storm from some distance, and you are in a vehicle, you should try to escape from it. Some dust storms can travel at more than 75 miles per hour, but they frequently travel much slower. However, it is not advisable to put yourself at risk by driving at high speed.
Stay inside. Do not move about in a storm, as you will not be able to see hidden risks in your path. So if you’re in a house, stay inside.
Protect yourself from flying objects. Cover as much of your body as possible. A dust storm’s high wind can carry heavy objects. If you find yourself without shelter, try to stay low, close to the ground, and protect your head with your arms, a backpack or a pillow.
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A.Dust storms usually travel much slower than vehicles.
B.Don’t be so worried about dust storms in the distance.
C.You shouldn’t drive at a risky speed to escape from dust storms.
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A.it is dangerous to travel on hot summer days
B.dust storms usually come from far away
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D.small objects blown by a storm’s wind cannot harm people
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C.A bottle of milk.
D.A travel guide.
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