D. Not all dog owners should attend classes about the responsibilities of dog ownership.

　　【解析】选C。细节理解题。根据第七段“It is clear that not all dog owners appreciate that children should not be left unsupervised with a dog”可知, 雷切尔医生认为, 并非所有的狗的主人都认为孩子们和狗在一起的时候要有大人的照看。由此判断选C项。

　　4. Which of the following can be the best title for the passage?

　　A. Dogs, Dangerous To Children

　　B. Children Should Know Behaviors Around Dogs

　　C. Doctors, Treat Dog Bites Correctly

　　D. Never Leave Children Unsupervised With Dogs

　　【解析】选D。主旨大意题。狗咬人, 尤其是狗咬小孩的现象比较严重, 那么如何避免狗咬小孩呢? 这才是本文的写作重点, 而只有D项更能说明此问题, 故正确答案选D项。阅读下列材料，从每题所给的选项中选出最佳选项。体裁：说明文　话题：能源安全　词数：319　时间：5′

　　Nuclear power's danger to health, safety, and even life itself can be summed up in one word: radiation.

　　Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses.It can't be seen or heard, or touched or tasted, even though it may be all around us.There are other things like that.For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver.Similarly, we can't sense radioactivity without a radiation detector.But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.

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