问题 计算题

“5.7”空难发生后,“黑匣子”的打捞工作始终是人们关注的焦点,为了尽快将它打捞出水,专家们在失事海域进行探测,测量船在海面向海底发射波速为1450 m/s的超声波,并测得超声波从发射到反射回海面经历的时间为0.2 s,则“黑匣子”所在的海域的深度约为多少?

答案

145 m

选择题
完形填空

Christmas is over. And I got my wanted radio-controlled truck. But you would not believe the ___1___ and work that went into getting this holy toy.

For over a month I stared at ___2___ magazines I received from my friend until I had made up my ___3___: I wanted a Pumpkin truck. I ___4___ 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 ___5___, but he just blamed the problems on my bad ___6___.

My next plan would have to be more ___7___. “Look at this, Dad, the truck with controller and battery pack—all for only US$250!” You can’t ___8___ to miss out on this bargain!”

His ___9___ was that he certainly could afford to miss this ___10___ and for US$250 you could buy ___11___ 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 ___12___ home! This is my youth! I am supposed to run about.”

I went to my room, ___13___ at how mean(吝啬的) my father was. It was obvious that he didn’t ___14___ that I would die if I did not get the Pumpkin radio-controlled truck.

When I ___15___ on Christmas morning I wasn’t excited. I had been ___16___. I opened all my presents until there was just one big package ___17___. “The telescope,” I thought. I ___18___ the packaging and looked at the top of the box—it was a Pumpkin truck. I had ___19___! I loved my parents! I felt like I could do anything! I could ___20___ get an A+ in English class.

1. A. pain       B. attempt      C. joy     D. shyness

2. A. housing  B. fishing       C. car      D. fashion

3. A. mind      B. idea    C. opinion      D. head

4. A. get  B. set      C. searched     D. went

5. A. operate   B. run     C. start    D. work

6. A. riding     B. driving       C. thinking     D. keeping

7. A. strong    B. practical     C. ideal   D. obvious

8. A. afford    B. pay     C. allow  D. stand

9. A. talk B. expression  C. face    D. response

10. A. truck    B. telescope    C. chance       D. bargain

11. A. one       B. something  C. everything  D. nothing

12. A. heating B. loving C. nursing      D. finding

13. A. pleased B. good   C. expert D. angry

14. A. say       B. believe       C. care    D. learn

15. A. went off      B. woke up     C. rang up      D. found out

16. A. worried       B. instructed   C. warned       D. defeated

17. A. opened B. wrapped     C. left     D. faded

18. A. recovered     B. refused       C. reopened    D. removed

19. A. won     B. done   C. beaten D. failed

20. A. ever     B. already       C. still     D. even