题干

伦敦奥运会期间英国军方将配备一种远程声波安保设备,该设备工作时可以产生高达150分贝的声音,尖锐的声响会让人耳感到刺痛,既可用作高音喇叭,也可用作非致命性武器驱散人群。关于该设备,下面说法正确的是(     )

A:该设备产生的是超声波

B:该设备产生的是次声波

C:“150分贝”是指所产生声音的响度

D:“150分贝”是指所产生声音的音调

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答案(点此获取答案解析)

C

同类题2

阅读理解

    A couple of weeks ago, a few friends and I had an opportunity to attend a dear friend's wedding in New York. After the wedding and reception, rather accidentally four of us gathered in a hotel room and began to explore the deeper meaning of life and death. What does it mean to live truly? If we are all getting closer to death, is all the material accumulation worth it? It is not exactly the type of conversations one has at a wedding.

    While the answers varied from person to person, I was left with more questions than answers and a feeling of gratefulness to be surrounded by friends who were asking the “right” questions. As the clock kept ticking past 3 a.m., one of the roommates suggested we watch a short film titled “Last Days of Zach Sobiech”. The film is about a teenager's journey through the last days of his incurable illness. The film brought up a lot of mixed emotions but one quote that stood out for me was Zach's simple explanation of happiness, “What makes one happy is seeing someone else smile because you put it there.” By 4 a.m. , there was this energy in the room that had to be shared! With a few packages of post-it notes, we hit the halls of the hotel. We decided to leave short inspirational words on guests' doors, so when they opened their doors few hours later a smile would turn up.

    We ended up sticking post-it notes on all the doors until we ran out of them. The note on the door of the newly-weds properly said, “Where there is love, there is life.”

同类题4

阅读下文,回答以下问题。

      武松见了,叫声:“呵呀!”从青石上翻将下来,便拿那条梢棒在手里,闪在青石边。那个大虫又饥又渴,把两只爪在地下略按一按,和身望上一扑,从半空里撺将下来。武松被那一惊,酒都做冷汗出了。说时迟,那时快,武松见大虫扑来,只一闪,闪在大虫背后。那大虫背后看人最难,便把前爪搭在地下,把腰胯一掀,掀将起来。武松只一闪,闪在一边。大虫见掀他不着,吼一声,却似半天里起个霹雳,震得那山冈也动;把这铁棒也似虎尾倒竖起来,只一剪,武松却又闪在一边。原来那大虫拿人,只是一扑,一掀,一剪,三般提不着时,气性先自没了一半。那大虫又剪不着,再吼了一声,一兜兜将回来。

      武松见那大虫复翻身回来,双手轮起梢棒,尽平生气力,只一棒,从半空劈将下来。只听得一声响,簌簌地将那树连枝带叶劈脸打将下来。定睛看时,一棒劈不着大虫。原来慌了,正打在枯树上,把那条梢棒折做两截,只拿得一半在手里。那大虫咆哮,性发起来,翻身又只一扑,扑将来。武松又只一跳,却退了十步远,那大虫却好把两只前爪搭在武松面前。武松将半截棒丢在一边,两只手就势把大虫顶花皮胳月荅地揪住,一按按将下来。那只大虫急要挣扎,被武松尽气力纳定,哪里肯放半点儿松宽?武松把只脚望大虫面门上、眼睛里,只顾乱踢。那大虫咆哮起来,把身底下扒起两堆黄泥,做了一个土坑。武松把那大虫嘴直按下黄泥坑里去。那大虫吃武松奈何得没了些气力。武松把左手紧紧地揪住顶花皮,偷出右手来,提起铁锤般大小拳头,尽平生之力,只顾打。打得五七十拳,那大虫眼里、口里、鼻子里、耳朵里都迸出鲜血来,更动弹不得,只剩口里兀自气喘。武松放了手,来松树边寻那打折的棒橛,拿在手里;只怕大虫不死,把棒橛又打了一回。那大虫气都没了。武松再寻思道:“我就地拖得这死大虫下冈子去。”就血泊里双手来提时,哪里提得动!原来使尽了气力,手脚都酥软了,动掸不得。