问题
多选题
下列现象中跟回声有关的是（ ）
A．船只利用“声呐”测定海底中的暗礁
B．雷雨天时听到轰隆隆的雷声
C．蝙蝠利用超声波捕捉蚊虫
D．夜深人静时说话特别响亮
答案
ABC
搜题请搜索小程序“爱下问搜题”
下列现象中跟回声有关的是（ ）
A．船只利用“声呐”测定海底中的暗礁
B．雷雨天时听到轰隆隆的雷声
C．蝙蝠利用超声波捕捉蚊虫
D．夜深人静时说话特别响亮
ABC
On Christmas Day, I got my wanted radio-controlled truck. But you would not believe the ___36___ and work that went into getting this holy toy. For over a month I stared at ___37___ magazines I received from my friend until I had made up my ___38___: I wanted a Pumpkin truck. I __39___ to work immediately, dropping hints to my father about it. My first job was to tell him about how the steering(操纵杆) on my old car didn’t __40___, but he just blamed the problems on my bad ___41__. My next plan would have to be more __42__. “Look at this, Dad, the truck with controller and battery pack—all for only US$250!” You can’t __43__ to miss out on this bargain!” His ___44___ was that he certainly could afford to miss this ___45___ and for US$250 you could buy ___46___ educational like a telescope. “A telescope? To look at the moon? I’ll look at it when I’m 97 years old and living in a ___47___ home! This is my youth! I am supposed to run about.” I went to my room, ___48___ at how mean my father was. It was obvious that he didn’t _49__ that I would die if I did not get the Pumpkin radio-controlled truck. When I __50__ on Christmas morning I wasn’t excited. I had been __51__. I opened all my presents until there was just one big package ___52__. “The telescope,” I thought. I ___53___ the packaging and looked at the top of the box—it was a Pumpkin truck. I had ___54___! I loved my parents! I felt like I could do anything! I could ___55___ get an A+ in English class.
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