A．It provides clear photos of moving organs.

　　B．It can take 3­dimensional (三维) pictures of inside organs.

　　C．It won't cause serious skin burns，cancer or other damages to the body.

　　D．It helps to find out what is going on inside a person's body without opening it up.

　　解析：细节理解题。根据第四段中的“The latest CAT scanners can even give clear pictures of active，moving organs”可知选A项，

　　答案：A

　　8．We can infer from this passage that ________.

　　A．patients in front of CAT scanners may suffer from a bit of radiation

　　B．doctors need no opening­up of the body with CAT scanners

　　C．CAT scanners are more expensive than regular X­ray machines

　　D．CAT scanners can take photos of either the whole body or a part of it

　　解析：推理判断题。根据倒数第二段中的Yet CAT scans actually don't cause the patient to more radiation than regular X­rays do.可以推出答案为A项。

　　答案：A

　　9．The best title of this passage might be ________.

　　A．the Newest Medical Invention

　　B．New X­ray Machine to Save Lives

　　C．How to Avoid the Damage of X­Rays

　　D．Advantages and Disadvantages of CAT Scanners

　　解析：标题选择题。根据全文内容可知，本文主要介绍新型X­rays仪器在医学上的应用与优点，故选B项。

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