.

　　A.evidences

　　B.facts

　　C.faults

　　D.failures

　　73. People with fair skin and freckles

　　.

　　A.seldom use sunscreen

　　B. are more in danger of skin concer

　　C. can be free from the harm of the sun

　　D. often expose themselves to the sun

　　74. We can learn from the passage that

　　.

　　A. sunscreen users get skin cancer more often

　　B. the volunteers have proved the effect of sunscreen

　　C. the new study was based on the experiences of volunteers

　　D. the number of skin cancer patients is increasing in America

　　75. Which of the following can be the beat title for this passage?

　　A. Sunscreen to Prevent Skin Cancer

　　B. Sunscreen to Increase Skin Cancer

　　C. Skin Cancer Caused by Sunscreen

　　D. Skin Cancer Caused by Freckles

　　B

　　Women are friendly. But men are more competitive. Why? Researchers have found it's all down to the hormone oxytocin (荷尔蒙催生素). Although known as the love hormone, it affects the sexes differently.

　　"Women tend to be social in their behavior. They often share with others. But men lend to be competitive. They are trying to improve their social status," said Professor Ryan.

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