分析 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了雨滴的形成過程和怎樣的雨滴才能順利落到大地上.
解答 68.A.細(xì)節(jié)理解題,根據(jù)第一段The effect of gravity on them is slight.Air currents move and lift droplets so that the net downward amount of water is zero,even though the droplets are moving constantly可知冰晶不會立即掉落到地球,因為他們被氣流保持在那兒;故選A.
69.A.詞義猜測題.根據(jù)第二段To the casual observer,dust seems to act in a totally random fashion,moving about可知對于偶然的觀察者來說,塵埃似乎完全是隨機的,四處移動;意為難以預(yù)料的;故選A.
70.C.細(xì)節(jié)理解題.根據(jù)第三段Only when the droplet grows to a diameter of 0.008inch or larger can it fall from the cloud可知只有當(dāng)液滴的直徑增大到0.008inch或大到可以從云中落下;故選C.
71.D.細(xì)節(jié)理解題.根據(jù)第三段The average raindrop contains a million times as much water as a tiny cloud droplet可知雨點平均含有一百萬倍的水的小云滴;故選D.
點評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進(jìn)行合乎邏輯的推理判斷.
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