QThe reason why the author was puzzled and angry with the dog was that ________.

　　A．Howard had a strange behavior

　　B．Howard should be afraid of the metal poles

　　C．Howard should know the approaching of the terrible lightning

　　D．Howard bit his trousers in his teeth

　　答案：A　细节理解题。根据本段第五句内容可知答案。

　　4．...

　　“We examined non­facial skin that was protected from the sun, and found that the total number of packs of cigarette smoked per day and the total years a person has smoked were linked with the amount of skin damage a person experienced，” Dr Yolanda, who led the study, said in a statement.

　　“In participants older than 65 years, smokers had significantly more fine wrinkling than nonsmokers. Similar findings were seen in participants aged 45 to 65 years.” Yolanda's team added in their report.

　　The researchers tested 82 people, smokers and nonsmokers, taking pictures of the inner right arms. They ranged, in age from 22 to 91 and half were smokers. Independent judges decided how wrinkled each person's skin was.

　　When skin is exposed to sunlight, especially the face, it becomes coarse (粗糙的). Wrinkled and discolored with a pale yellow tint, Yolanda's team wrote.

　　...

　　QAccording to the passage, how wrinkled a person's skin is doesn't relate to ________.

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