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【单选题】
遇到高温时，房屋建筑材料会发出独特的声音。声音感应报警器能够精确探测这些声音，提供一个房屋起火的早期警报，使居住者能在被烟雾困住之前逃离。由于烟熏是房屋火灾人员伤亡最通常的致命因素，所以安装声音感应报警器将会有效地降低房屋火灾的人员伤亡。下列哪一个假设如果正确，最能反驳上面的论述?（ ）A.
声音感应报警器广泛使用的话，其高昂成本将下降
B.
在完全燃烧时，许多房屋建筑材料发出的声音在几百米外也可听见
C.
许多火灾开始于室内的沙发坐垫或床垫，产生大量烟雾却不发出声音
D.
在一些较大的房屋中，需要多个声音感应报警器以达到足够的保护
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【单选题】某猫病死前出现消化不良,下痢贫血、水肿、消瘦等症状。剖检见肝脏肿大, 胆管增生、胆囊及胆管内有多条呈叶形、体长 1~2cm 的虫体。该病可能 ()?
A.
肝片吸虫病
B.
并殖吸虫病
C.
华支睾吸虫病
D.
细粒棘球绦虫病
【单选题】Why does the author mention both Boston and Chicago?
A.
To demonstrate positive and negative effects of growth
B.
To show that mass transit changed many cities
C.
To exemplify cities with and without mass transportation
D.
To contrast their rate of growth
【简答题】单词拼写。 根据句意、单词首字母或汉语提示写出可以填入句中空格处的单词。 1. We e______ rice but import wheat. 2. After the star's excellent performance on the stage, the a____________ all burst into cheers. 3. Don't play t__________ on ...
【单选题】听力原文：W: These steel chairs are on sale for $ 85 each or $150 for a pair. How many would you like to have? M: Let me have a look. Oh, good! I think I'd like to have two. How much will the woman pay for...
A.
$150.
B.
$85.
C.
$115.
D.
$170.
【简答题】根据句意，用所给单词的适当形式填空。 小题1:His father used to smoke very ____________ (heavy). 小题2:When they saw their favourite film stars, they shout with ____________ (excited). 小题3:Though the old man is in his ______...
【单选题】Unfortunately not all of us obtain our just______in this life.
A.
demands
B.
gains
C.
deserts
D.
wins
【简答题】Why does the author mention both Boston and Chicago?
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