11. Alarms ___13____ the same concept have already been installed on emergency vehicles.
A. basis on B. base on C. basing on D. based on
分析:Alarms是主语,have already been installed是谓语,所以要填的动词应该是分词形式,做定语,所以四个答案只有D可能, be based on以。。。为基础。
12. The alarms will also include rising or falling frequencies to indicate whether people should go up __14___ down stairs.
A. or B. and C. but D. otherwise
分析:根据前半句的rising or falling frequencies,可以看出这句话也应该填连接词or, 表示或者。
13. They were __15__ with the aid of a large grant from British Nuclear Fuels.
A. developed B. determined C. discovered D. delivered
分析:主语they 代指the alarms, 后半句是说这种设备得到大笔资助。根据上下文,资助的目的是为了开发,所以应该选A。
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