什么是骨折？

关于以儿童作为受试者，正确的是（）

A.儿童是弱势群体，在任何情况下都不能使用儿童作为实验的受试者

B.如果以儿童为受试者能够取得比用成人为受试者更好的实验结果，就可以为使用儿童为受试者进行伦理辩护

C.以儿童为受试者必须得到其监护人的同意，而且实现必须经过动物或成人实验证明其有益无害

D.只要父母同意，使用儿童为人体实验的受试者就可以得到伦理学辩护

E.当受试者不满18周岁时，可以不遵循知情同意原则

第二节：完形填空（共20小题，每小题1．5分，满分30分）

阅读下面的短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C、D）中，选出最佳选项．

A while ago，I didn’t think I had a passion．1 would sit in front of the TV all day and not think about anything except the next  36   ．At that time，I didn’t know how   37   it was to have a passion in our life．

The first   38   I thought about this was in the seventh grade when 1 went to school with my mom．As we stopped at a red light，someone   39   my eyes．It was a man dressed in old   40  standing on the other side of the    41   ．This homeless man was not sitting down with a sad and hopeless   42  ．He was standing，waving his hands and dancing．He looked happy and held a radio as if it was the most   43   thing he had．

Seeing all this   44    me．“Morn，why does that man have a radio even though he’s homeless？”I asked．

“He bought it，”she replied．1 was still   45   ．

“But if he’s homeless，why doesn’t he use his money to buy clothes？He  46  his money on something he doesn’t need．He should buy food．”

“Well，Sarah，sometimes food isn’t the most important thing．   47   can be food for the

48   ．Food and clothes aren’t the only things we need．People need happiness to stay  49   ，too．”

I wasn’t sure whether I  50  my mother’s words．Maybe my mom was right．If one lives in sadness，there’s  51   to keep him moving from day to day．

Now I  52   that I’ve had passions all along，but never recognized their importance in my life．They were invisible（无形的）hopes that I   53   without knowing them．What’s often forgotten is that we all need a  54   ，a light on a   55   day．We all need a passion．

36．A．display                   B．show                      C．exhibition        D．show off

37．A．efficient                 B．effective                 C．important         D．valuable

38．A．moment                  B．period                    C．date                        D．time

39．A．caught                    B．seized                     C．held                       D．held on to

40．A．cloths                     B．clothes                    C．clothing                  D．coat

41．A．way                       B．passage                   C．road                       D．express way

42．A．expression              B．looks                      C．face                        D．eyes

43．A．invaluable        B．expensive                C．precious                  D．worthless

44．A．shocked                  B．astounded        C．astonishing              D．surprised

45．A．puzzled                  B．wondered                C．confused                 D．amazed

46．A．spent               B．wasted                    C．took                       D．cost

47．A．Passion                 B．Music                     C．Love                      D．Happiness

48．A．soul                       B．mind                      C．heart               D．brain

49．A．1ive                       B．living                        C．alive                       D．1ively

50．A．understood             B．agreed                    C．see                         D．have gotten

5 1．A．none                     B．nothing                   C．no one                    D．anything

52．A．find out                  B．know about             C．come true        D．realize

53．A．depended         B．relied on                 C．relied                     D．1ay in

54．A．pleasure                 B．fun                         C．joy                         D．enjoy

55．A．darkness                 B．dusk                       C．dim                        D．dark

牛夏天怕热，冬天怕冷，这种说法对吗？

如图是停车让行标志。

火力发电厂中的汽轮机是将蒸汽的热能转变为机械能的设备。