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6.Features such as height,weight,and skin color ____ from individual to individual. A.change B.vary C.alter D.convert 解析 vary常和from搭配使用,构成:vary from ...to...由……到……不等。 7.We have planted a great many trees in order to ____ wind and sand in the desert. A.hold down B.hold up C.hold back D.hold out 解析 hold back阻挡;hold down抑制(价格等); hold up举起;推迟;hold out伸出;坚持。 B C 8.It’s bad manners to ____ when others are talking to you. A.switch to B.switch off C.switch on D.switch over 解析 句意为:当别人对你说话时,你不理不睬是 不礼貌的。switch off关上;不听,不理睬。 9.He who is proud of his wealth has rarely ____ else to be proud of. A.anything B.something C.everything D.nothing 解析 have something to be proud of有可以自 豪的事情。rarely几乎没有,具有否定意义,故选 | 
