If roundworms are removed from the soil and placed in a liquid, they thrash <u>helplessly </u>around.

试卷相关题目

• 1The members of Aaron Burr's family were noted for their passionate and <u>headstrong </u>temperament.

  A.intellectual

  B.stubborn

  C.witty

  D.steadfast

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• 2Because of Delaware's lenient laws regarding business incorporation, many companies have their <u>headquarters</u> in the state's largest city, Wilmington.

  A.production plants

  B.home offices

  C.sales representatives

  D.chemical laboratories

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• 3In the eighteenth century the <u>heading</u> of “natural philosophy” encompassed all of the sciences.

  A.category

  B.teachings

  C.ideology

  D.leaders

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• 4Modern nursing practices not only <u>hasten</u> the recovery of the sick but also promote better health through preventive medicine.

  A.permit

  B.determine

  C.accelerate

  D.accompany

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• 5The best olive oil is obtained from olives that are <u>harvested</u> just after they ripen and before they turn black.

  A.preserved

  B.squeezed

  C.gathered

  D.sorted

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• 6Due to the tilt of Neptune's axis, the Sun heats the planet's northern and southern <u>hemispheres</u> unequally.

  A.climates

  B.halves

  C.atmospheres

  D.contours

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• 7Compared with large aircraft, small airplanes are not as streamlined and <u>hence</u> are less efficient.

  A.at a glance

  B.to a measurable degree

  C.in most cases

  D.as a result

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• 8Sedimentary rocks cover much of the Earth's surface, but they are often <u>hidden </u>by a thinveneer of soil.

  A.concealed

  B.eroded

  C.protected

  D.softened

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• 9To cool itself, a rhinoceros soaks in mud or water because its thick <u>hide</u> has no sweat glands.

  A.skin

  B.tongue

  C.horn

  D.trunk

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• 10Charles Whecler's paintings often <u>highlight</u> the sharp edges and geometrical shapes of machines.

  A.extend

  B.emphasize

  C.distort

  D.soften

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