题干

在下面一段文字横线处补写恰当的语句,使整段文字语意完整连贯,内容贴切,逻辑严密。每处不超过15个字。

    人类总是依据自身的规范和准则将外物分成优劣好坏,①____。现在令人讨厌的沙尘暴,其实是大自然中的一项工程,且在全球生态平衡中占有一席之地。沙尘暴固然会使空气中的可吸入颗粒物增加,但由于沙尘含有碱性,②____,从而减缓酸雨的发生。风将大陆的沙尘吹向海洋,又将海洋的水汽吹向大陆,沙尘和水汽相遇,便能结合为云,最终化作降水。可见,沙尘不仅在土壤的分布和补充上扮演着重要角色,③____。可以说,沙尘也是决定全球生态平衡的因子。

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\u800c\u5927\u81ea\u7136\u53e6\u6709\u4e00\u5957\u884c\u4e3a\u89c4\u8303\u548c\u51c6\u5219,\u53c8\u53ef\u4e2d\u548c\u5927\u6c14\u4e2d\u7684\u9178\u6027\u7269\u8d28,\u4e5f\u5728\u5168\u7403\u6c34\u5faa\u73af\u4e0a\u626e\u6f14\u7740\u91cd\u8981\u89d2\

同类题2

阅读理解

Three Feet From Gold

    Darby's uncle was caught by the “gold fever” in the gold-rush days, and went west to dig and grow rich. After months of labor, he was rewarded by the discovery of the shining ore (矿石). He needed machinery to bring the ore to the surface. So, with the “strike”, he returned home. And with the help of Darby, he borrowed a lot of money. After buying the machinery and having it shipped, Uncle and Darby went back to work the mine.

    The first car of ore was mined. And the returns proved they had one of the richest mines in Colorado! Down went the drills! Up went the hopes of Uncle and Darby!

    Then something happened! The vein (矿脉) of gold ore disappeared! They drilled on, but all in vain. Finally, they decided to quit and sold the machinery to a junk man for a few hundred dollars. The junk man called in a mining engineer to look at the mine and do a little calculating. The engineer's calculations showed that the vein would be found just three feet from where the Darbys had stopped drilling! The junk man took millions of dollars in the vein, because he knew enough to seek expert's advice before giving up.

    Most of the money which went into the machinery was borrowed through the efforts of Darby, who was then a very young man. The money came from his relatives because of their faith in him. He paid back every dollar of it, although he was years in doing so.

    Long afterward, Mr. Darby made another discovery that desire can be changed into gold. This discovery came after he went into the business of selling life insurance. Remembering that he lost a huge fortune, for he stopped three feet from gold, Darby profited by the experience in his chosen work, saying to himself, “I stopped three feet from gold, but I will never stop because men say 'no' when I ask them to buy insurance.”

    Darby sold more than a million dollars in life insurance annually. He owes his “stickability” to the lesson he learned from his “quitability” in the gold mining business.