题目内容

1．The Chinese teacher often requires the students to talk about writers and books________ they like most．（　　）
A．thatB．whichC．whoD．whom

分析 语文老师经常要求同学们谈一下他们最喜欢的作者和书．

解答 答案：A   从句子结构来看，该句包含了一个定语从句，且空白处填的应该是个作宾语的关系代词，先行词是writers and books，指人又有物，所以只能是that，固答案为A．

点评 分析先行词，以及从句中的成分，以便分清用什么关系词，

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11．A new study suggests that early exposure to germs（细菌） strengthens the immune（免疫的）system．That means letting children get a little dirty might be good for their health later in life．
The study involved laboratory mice．It found that adult mice raised in a germ-free environment were more likely to develop allergies．asthma and other autoimmune disorders． There are more than eighty disorders where cells that normally defend the body instead attack tissues and organs．
Richard Blumberg，who led the study，is a professor at'Harvard Medical School in Boston，Massachusetts．He says，in 1989，medical researchers who sought to explain these diseases，first discovered that the increasing use of antibacterial soaps and other products，especially early in life，could weaken immune systems．
Now，Dr．Blumberg and his team have what is the first biological evidence to link early exposure to germs to stronger adult immune systems．They say this exposure could prevent the development of some autoimmune diseases．
In the adult germ-free mice，they found that inflammation（发炎）in the lungs and colon was caused by so-called killer T cells．These normally fight infection．But they became overactive and targeted healthy tissue-an autoimmune condition seen in asthma and a disease called ulcerative colitis．
Dr，Blumberg says the mice raised in a normal environment did not have the same reaction．He says their immune systems had been"educated"by early exposure to germs．
Rates of autoimmune disorders are rising worldwide，but mostly in wealthier，industrialized countries．According to Dr．Blumberg，it might be high time that people were warned to be more careful with the early use of antibiotics（抗生素） and the prescription from their doctors．
Rob Dunn is a professor of ecology and evolutionary biology at North Carolina State University in Raleigh．He says the new study does not mean people should stop washing．"Wash your hands，but don't do it with antibacterial soap．Let your kids play in a reasonable amount of dirt and get outside and get exposed to a diversity of things"，says Rob Dunn．
71．Who first found immune systems might get harmed by overly using antibacterial products？C
A．A professor of ecology and evolutionary biology．
B．A professor at Harvard Medical School in Boston．
C．Medical researchers who tried to explain autoimmune disorders．
D．Medical researchers who tried to treat autoimmune disorders．
72．To keep healthy in the future，children had betterA．
A．play in a dirty environment once in a while
B．live in a germ-free endronrnent
C．use plenty of antibacterial soaps
D．stay in under developed countries
73．Why are germ-free mice easy to develop lung inflanunation？B
A．Because their T celh fight bacteria effectively．
B．Because their T cells attack the healthy tissues．
C．Because their lungs become abnormally active．
D．Because their lungs have weaker tissues．
74．It can be inferred from the text thatD．
A．washing hands is no longer a good habit for children
B．antibiotics will be forbidden in children's hospitals
C．exposure to dirt helps build children's character
D．the abuse of antibiotics may be condemned
75．Where does this text most probably come from？C
A．A teacher's handbook．     B．A story book．
C．A science magazine．       D．A travel journal．
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只允许修改10处，多者（从第11处起）不计分．
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