2．The underlined word “detrimental” could be replaced by________.

　　A．aggressive B．disappointing

　　C．ridiculous D．harmful

　　3．We can learn from the passage that high-quality friendship most probably results from________.

　　A．social skills and good study habits

　　B．school grades and classroom behaviors

　　C．academic success and social adaptation

　　D．positive parental involvement and social skills

　　4．From the last paragraph we can conclude that Dr.Robbie Adler-Tapia agrees that________.

　　A．parents should regard making friends as something that just happens

　　B．it’s wise for parents to support and encourage healthy peer relationships

　　C．parents only need to help their children to cope with difficult social situations

　　D．parents are supposed to encourage their children to make as many friends as they can

　　B

　　(2016·合肥一模)

　　Can people change their skin color without suffering like pop king Michael Jackson？Perhaps yes.Scientists have found the gene that determines skin color.

　　The gene comes in two versions，one of which is found in 99 per cent of Europeans.The other is found in 93 to 100 per cent of Africans，researchers

　　at

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