高一英語外研版必修3課堂15分鐘達標(biāo)練：module4period1版含解析(存儲版)
【正文】 arming brings more harm than benefits to humans D. human activities are a major cause of sandstorms 【解析】 選 D。 課堂 15 分鐘達標(biāo)練 A sandstorm, also known as a dust storm, is exactly what it sounds like. A very strong windstorm especially in the desert carries clouds of sand or dust that greatly reduces visibility. This wind is usually caused by convection currents(對流氣流 ), which are created by intense heating of the ground, and is usually strong enough to move entire sand dunes. Air is unstable when heated, and this instability in the air will cause higher winds to mix with winds in the lower atmosphere, producing strong surface winds. Sandstorms can disturb people’s travel, and can sometimes destroy whole roads, and dry flat areas. Similar dust storms can be
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