In 200 Years Cows May Be the Biggest Land Mammals (哺乳动物) on the Planet
Around 13,000 years ago North America had a wider variety of mammals than modern Africa. There were multiple horse species, camels and some now-extinct animals. And such
Scientists have long debated what caused all these large creatures to go extinct while many of the smaller ones
If the extinction trend continues, many more large mammals will soon disappear as well, as the primary threats from humans have
The average
This finding does not mean climate-related changes could not have
Smith says the lesson to be learned from the new findings is that our ancestors prepared us to be extremely skillful killers. “What’s
A.smart | B.massive | C.marine | D.ancient |
A.survived | B.shrank | C.escaped | D.returned |
A.hide away | B.bring up | C.break up | D.die out |
A.faded | B.restored | C.improved | D.expanded |
A.absolutely | B.predictably | C.exclusively | D.potentially |
A.weight | B.speed | C.size | D.appetite |
A.production | B.appearance | C.exploration | D.cruelty |
A.recorded | B.contemporary | C.evolutionary | D.conclusive |
A.link | B.contact | C.adaptation | D.distinction |
A.enlarged | B.stressed | C.impressed | D.dominated |
A.Moreover | B.Otherwise | C.Meanwhile | D.Rather |
A.species | B.hope | C.rule | D.threat |
A.grow | B.digest | C.withdraw | D.adapt |
A.instructive | B.tremendous | C.different | D.marvelous |
A.sponsors | B.creators | C.consumers | D.producers |
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A.hanging | B.waiting | C.lying | D.sitting |
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A.consider | B.discover | C.know | D.understand |
A.laughed | B.left | C.relaxed | D.smiled |
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A.way | B.right | C.pleasure | D.form |
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A.reporting | B.reported | C.report | D.to report |
A.waste | B.wasted | C.wasting | D.wastes |
A.when | B.how | C.why | D.where |
A.doctors | B.students | C.workers | D.teachers |
A.one day | B.every day | C.someday | D.everyday |
A.my | B.ourselves | C.our | D.ours |
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A.outwards | B.regularly | C.naturally | D.backwards |
A.shrinking | B.flooding | C.expanding | D.growing |
A.wonderful | B.fancy | C.tough | D.single |
A.theme | B.belief | C.goal | D.direction |
A.sad | B.tired | C.hungry | D.excited |
A.likely | B.afraid | C.nervous | D.willing |
A.effect | B.difference | C.change | D.effort |
A.losing | B.planting | C.selling | D.protecting |
A.enjoy | B.take | C.reduce | D.seek |
A.talk about | B.meet with | C.say goodbye to | D.get close to |
A.problem | B.cause | C.method | D.benefit |
A.surrounding | B.varying | C.including | D.reaching |
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A.watching | B.helping | C.welcoming | D.teaching |
A.great | B.unusual | C.easy | D.sad |
A.dream | B.see | C.need | D.develop |
A.environment | B.weather | C.area | D.beauty |
A.disadvantages | B.favorites | C.wishes | D.answers |
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A.sky | B.village | C.city | D.street |
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A.identify | B.increase | C.decrease | D.choose |
A.victim | B.discipline | C.exhibition | D.concept |
A.Particularly | B.Similarly | C.Surprisingly | D.Generally |
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A.expansion | B.obstruction | C.motion | D.addiction |
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A.highlight | B.justify | C.delay | D.convey |
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