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Dear Mr. Black,

I’m very thank to you for inviting me to stay with you in the come summer vacation. I have been dreamed of seeing you again so that I can get help from you in my English learning. And I’m afraid I cannot go to your place in this summer. I’ve promised my grandmother, she lives in the country, to spend this summer with her. She misses me too much that I find difficult to refuse her request. I’m busy preparing for my examinations in present. I planned to visit you in winter if it’s convenient to you.

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Living in an exciting social environment was found to reduce fat in mice's belly by half over four weeks, even if they ate more. US researchers say that social excitement aids weight loss by turning white fat into brown. White fat stores calories and makes us fatter, while brown burns energy to produce heat. Turning white fat into brown is extremely difficult, normally requiring long- term stay in cold conditions or exciting part of the body's nervous system.

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1.What information can we get from the first two paragraphs?

A. Brown fat stores calories and makes us fatter.

B. It doesn’t take long to turn white fat into brown.

C. Brown fat can burn energy to produce heat.

D. Social excitement helps gain more weight.

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4. What’s the main idea of the text?

A. Socializing contributes to people's losing weight

B. Socializing is unnecessarily important in people’s daily life.

C. White fat can be changed into brown fat.

D. Brown fat is beneficial to people’s health.

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