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一、单项填空 1．—Mom，I lost ______ diamond ring you bought as my birthday present. —I’ll keep______ eye on it when I clean your bedroom. A．a；an B．the；an C．the；the D．a；the 解析：第一个空特指“你买给我做生日礼物的那个”，因此用定冠词the；第二个空考查固定搭配keep an eye on“留意，密切注视”。 答案：B 5．When we got to the gate of the museum，we saw visitors coming ______. A．a number of B．the number of C．on number D．in great numbers 解析：句意：当我们到达博物馆门口时，我们看到参观者蜂拥而来。修饰可数名词，表示“大批”时，常用in number或in(great/large/huge) numbers。 答案：D 6．This kind of food product is natural，with no______flavors added. A．accurate B．regular C．sensitive D．artificial 解析：考查形容词辨析。句意：这种食品是天然的，没有添加人造的香料。artificial“人造的”；regular“有规律的”；accurate“精确的”；sensitive“敏感的”。 答案：D 7．It can’t be a(n) ______ that two banks were robbed in one night. | 
