1、【题目】The megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
选项：
A.slithering
B.radiating
C.interfering
D.murmuring
答案：
B
解析：
暂无解析
1、【题目】The future survival of the bald eagle is still an important American ecological concern.
选项：
A.migration
B.population
C.existence
D.evolution
答案：
C
解析：
暂无解析
1、【题目】Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
选项：
A.straight
B.safe
C.real
D.rapid
答案：
解析：
1、【题目】ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
选项：
A.exhibition
B.concert
C.excursion
D.contest
答案：
解析：
1、【题目】 All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
选项：
A.asaresultof
B.considering
C.cognizantof(consciousof,awareof)
D.whatever
答案：
D
解析：
暂无解析
1、【题目】Bythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.
选项：
A.almost
B.definitely
C.already
D.universally
答案：
解析：
1、【题目】Whencarbonisaddedtoironintheproperproportions,theresultissteel.
选项：
A.container
B.sequence
C.laboratories
D.amounts
答案：
解析：
1、【题目】Bats fly, rather than glide, and thus are the only mammals capable of true flight.
选项：
A.straight
B.safe
C.real
D.rapid
答案：
C
解析：
暂无解析
1、【题目】How many people are aware that a dancer with the New York City Ballet typically wears out a minimum of two hundred pairs of toe shoes per year?
选项：
A.only
B.exactly
C.atleast
D.fewerthan
答案：
C
解析：
暂无解析
1、【题目】Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
选项：
A.whollyoperational
B.entirelyserviceable
C.fullyreliable
D.completelysafe
答案：
C
解析：
暂无解析