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　　4>. ___4___ produce(产生) a wide range(广的范围) of frequencies(频率) that (引导定语从句)enable(使。。。能够) the brain to determine(决定) where the ___5__ is coming from.
　　4. A. Alarms B. Alarm C. The alarm D. The alarms
　　分析：我们知道该空的名词应出现在前文，上一句就提到Sound Alert, is installing the alarms in a residential home。。。，所以这里所要填的词也应该是the alarms,选择答案D。
5. A. noise噪音 B. sound声音 C. music音乐 D. bell铃
　　分析：句子前半句是说a wide range(广的范围) of frequencies(频率)，所以发出的应是sound,因此答案选B。
　　5>. Deborah Withington(人名) of Sound Alert says that the alarms use(使用) most of(大多数的) the frequencies that can be ___6___by humans(人).
　　6. A. watched观看 B. produced 产生 C. learnt学习 D. heard听到
　　分析：文章一直在讨论警报器、声音，因此很容易推断应该是被人听到。
　　6>. “It’s a burst(突然发出的) of white noise(连续而均匀的声音) __7___ people say sounds like static(静电噪音) on the radio(收音机里), ”she says. “Its life-saving(挽救生命的) potential(潜力) is great.”
　　7. A. where B. what C. that D. how
　　分析：A、B、D都不能构成语意上的连贯，而只有C，构成一个句型，强调句，it’s ….that ….这句话强调的是主语。去掉it’s…that，剩下的完整句子就是：A burst of white noise，people say(插入语)，sounds like static on the radio。
　　7>. She conducted(进行) an experiment(实验) in which(引导定语从句，在这项实验中) people were filmed(被拍摄) by thermal—imaging(热效应成像) cameras(照相机) trying to find their way out of (找到从。。。出去的路)a large __8___ room.
　　A. smoked烟熏的 B. smoke-filled
　　C. filled with smoke D. smoke-filling使。。。烟火弥漫的
　　分析：从上下文可以看出，是一个定语修饰room，表示“充满了烟火的房间”
　　答案A，D意思不吻合，C作为定语，位置不应放在room前，应放后面。只有B才符合句子。
　　8>. It __9___ them nearly(几乎) four minutes to find the door __10____ a sound alarm, but only 15 seconds(秒) with one.
　　9. A. has taken B. takes C. took D. will take
　　分析：显然，这个空是考察常用句型：it takes / took sb some time to do sth.关键是确定动词时态，从前面看都是过去时态，所以选择C。
　　10. A. on B. near C. without D. from
　　分析：逗号后面的one应该是指a sound alarm，从连词but可以推断，前后应是意思相反，后面已有了with, 那么前句应是without, 所以选择C。读读意思很通顺。
9>. Withington studies how(如何) the brain(大脑) __11____sounds at the university.
　　A processes(处理) B. produces(产生)
　　C. possesses(拥有) D. proceeds(前进)
　　分析：句子主语是the brain应和“处理”构成主谓关系，而其它动词均不合适，所以选择A。
　　10>. She says that the __12___ of a wide band of frequencies(波段宽的频率) can be pinpointed(精确地确定) more easily than the source of a narrow band(窄波段).
　　12. A. feature特征 B. quality质量、素质
　　C. diagram图解 D. source来源
　　分析：解题关键是要看出句子中主要结构是more…than, 后面出现核心词the source, 所以可以推断得出结论，前面的名词也应是source.这样符合比较级用法，用来进行比较的事物必须具有可比性。所以选D。
　　11>. Alarms ___13____ the same concept(观念、概念) have already been installed(已经被安装) on emergency vehicles(急救车).
　　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(包括) rising (上升)or falling(下降) frequencies to indicate(指示) whether (是否)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。
Breastfeeding Can Cut Cardiovascular Risk
　　Breastfeeding can reduce the risk of a heart attack or stroke later in life and could prevent hundreds of __1__ of deaths each year，researchers said on Friday.
　　Babies who are breastfed have fewer childhood infectio