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】ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.

选项：

A.exhibition

B.concert

C.excursion

D.contest

答案：

解析：

1、【题目】The Native American interpreter Sacajawea was a valuable member of the Lewis and dark expedition in 1805.

选项：

A.veryfriendly

B.veryuseful

C.verythoughtful.

D.verywealthy

答案：

B

解析：

暂无解析

1、【题目】Blue－green algae grow abundantly in salt marshes.

选项：

A.primarily

B.slowly

C.onplants(cultivate)

D.ingreatnumbers

答案：

D

解析：

暂无解析

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】Blue－greenalgaegrowabundantlyinsaltmarshes.

选项：

A.primarily

B.slowly

C.onplants(cultivate)

D.ingreatnumbers

答案：

解析：

1、【题目】ThecompanyissuesanannualreporteveryMarch.

选项：

A.ayearly

B.acomprehensive

C.afinancial

D.aproduct

答案：

解析：

1、【题目】Eyespots, the most rudimentary eyes, are found in protozoan原生动物 flagellates 鞭毛虫 , flatworms 扁形虫 , and segmented worms片段 蠕虫 .

选项：

A.hostile-looking

B.perceptive

C.primitive

D.strangelyformed

答案：

C

解析：

暂无解析

1、【题目】Food must be moist in order to have a taste.

选项：

A.appetizing(delicious)

B.nutritious

C.damp

D.chewed

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

1、【题目】Oneofthegreatestbreakthroughsforprofessionalwomencamein1973whenthefieldofbankingopenedupforthem.

选项：

A.mostseriousdisappointments

B.mostsignificantadvances

C.mostabruptdeclines

D.mostcrucialsituations

答案：

解析：