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