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1.Due to the tilt of Neptune's axis,the Sun heats the planet's northern and southern hemispheres unequally.

A.climates

B.halves

C.atmospheres

D.contours

2.Compared with large aircraft,small airplanes are not as streamlined and hence are less efficient.

A.at a glance

B.to a measurable degree

C.in most cases

D.as a result

3.Sedimentary rocks cover much of the Earth's surface,but they are often hidden by a thinveneer of soil.

A.concealed

B.eroded

C.protected

D.softened

4.To cool itself,a rhinoceros soaks in mud or water because its thick hide has no sweat glands.

A.skin

B.tongue

C.horn

D.trunk

5.Charles Whecler's paintings often highlight the sharp edges and geometrical shapes of machines.

A.extend

B.emphasize

C.distort

D.soften

答案：BDAAB