| 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.
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