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. Its a burst of white noise __7___ people say sounds like static on the radio, she says. Its life-saving potential 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,its .that .这句话强调的是主语。去掉itsthat,剩下的完整句子就是:A burst of white noise,people say,sounds like static on the radio。
7. She conducted an experiment in which people were filmed by thermalimaging cameras trying to find their way out of 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 four minutes to find the door __10____ a sound alarm, but only 15 seconds 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。
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