A.Corals are unable to adjust to temperature changes. |
B.Cold temperature causes greater damage to corals. |
C.Hot temperature helps coral reefs to grow quickly. |
D.Heat and cold damage corals in their own ways. |
A.scientists used to pay no attention to the effect of cold events on corals |
B.2010 witnessed one of the greatest temperature differences on record |
C.corals prefer warmer conditions to cold temperatures in the long run |
D.global warming has nothing to do with the decrease of temperature |
A.corals may continue to grow in cold events after a few days |
B.cold events help corals grow more quickly in a short time |
C.corals show no response to hot temperatures in the first days |
D.corals are whitened mainly because of warm temperatures |
A.news report | B.scientific study | C.great imagination | D.natural conditions |
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A.normal | B.productive |
C.destructive | D.extreme |
A.Walking up to him/her and asking him/her why he/she is jealous of you. |
B.Walking up to him/her and asking him/her what the problem is. |
C.Spending some time with him/her and letting him/her know how you feel. |
D.Spending some time with him/her and letting him/her know you think there's something coming between you. |
A.to explain what causes jealousy |
B.to offer some advice on making friends |
C.to introduce the way to cope with a jealous friend |
D.to explain how destructive the jealous emotion is |
A.There's always a solution to solve the problem of jealousy. |
B.Jealousy can turn best friends into worst enemies. |
C.You may lose a friend to keep your own gifts,chances or self?development. |
D.You should go a long way with your friend to work out a solution |
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A.introduce the topic | B.draw our attention |
C.tell us what they have in common | D.tell us what is “cool” |
A.thought and acted differently from the majority |
B.had a calm and quiet attitude towards life |
C.didn’t observe rules and authorities |
D.had all kinds of “bad” manners |
A.do very well in their studies |
B.a(chǎn)re very skilled at sports |
C.a(chǎn)re good at chess and other thinking games. |
D.have supernatural powers like Harry Potter |
A.It is generally considered “cool” to be independent-minded and not to follow the crowd. |
B.“Cool” was used as early as the 15th century. |
C.Disobeying one’s parents and the authorities is considered “cool” among American young people nowadays. |
D.Getting the first place in an exam can also be considered “cool”. |
A.The origin of the word “cool”. |
B.The kinds of people who are “cool”. |
C.The changing meaning of the word “cool”. |
D.How to be a “ cool” person. |
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A.Drivers' age. | B.Passengers' sex. |
C.Driving experience. | D.Driving time. |
A.using no seatbelts | B.drinking water |
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A.Texting. | B.GPS programs. |
C.Automated replies. | D.Voicemail. |
A.offer parents practical suggestions |
B.summarize teens' driving practices |
C.a(chǎn)dvocate different driving habits |
D.set an example for the teens |
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A.By sounding a warning. |
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C.By checking the driving time. |
D.By pressing the steering wheel. |
A.a(chǎn)bout 400 milliseconds | B.below 500 milliseconds |
C.over 500 milliseconds | D.a(chǎn)bout 4 minutes |
A.moves more regularly |
B.stops working properly |
C.opens the window for the driver |
D.sounds more frequently and loudly |
A.a(chǎn)ims to reduce tiredness-related accidents |
B.has gone through testing at laboratories |
C.a(chǎn)ims to prevent drivers from sleeping |
D.has been on sale for 12 months |
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A.they hear the music much too often |
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A.be trained to like particular music |
B.make friends with real musicians |
C.find the beauty of chords without training |
D.enjoy the beauty of music when played by musicians |
A.the brain likes particular combinations of notes |
B.not a strange note was pleasant to all musicians |
C.how the chords were played was very important |
D.people’s ability to hear a musical note can be learnt |
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B.Love of music is not natural but nurtured. |
C.Listening to music can improve your brain. |
D.You can be a musician without being trained. |
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C.how to improve our environment |
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A.happiness | B.sadness | C.peace | D.excitement |
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A.the star is going to die |
B.special tools are used on it |
C.other stars come close to it |
D.it is seen from the space telescopes |
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B.The gravity of a black hole holds all light in its center. |
C.Scientists observe high-energy light through their own eyes. |
D.Some small black holes came into being as early as the universe. |
A.a(chǎn) black hole | B.the Milky Way |
C.a(chǎn) series of stars | D.a(chǎn) planet near the earth |
A.Neither the sun nor the earth is as heavy as a black hole. |
B.There is a supermassive black hole at the center of the Milky Way. |
C.The supermassive black hole had existed before the Milky Way was formed. |
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D.how scientists know about black holes |
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