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B. The instability of the wind. C. The intense heating of the ground. D. The speed of the wind. 【解析】 選 C。細(xì)節(jié)理解題。從第三段的句子 “In the United States of America, sandstorms are rare because of the lack of large deserts and more importantly the development of proper agricultural techniques. ”可知作者認(rèn)為人類應(yīng)該努力不讓土地變成沙漠。 3. The author will most probably agree that ______ . A. there will soon be no sandstorms in the USA B. humans haven’t thought of any way to deal with sandstorms C. death caused by sandstorms is increasing all the time D. humans should make more efforts to stop soil turning into desert 【解析】 選 D。從第一段的句子 “This wind is usually caused by convection currents, which are created by intense heating of the ground”可知沙塵暴的最初形成是因?yàn)榈孛娴臒崃俊?溫馨提示: 此套題為 Word