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情景：你上周在第一百货商店购买了一台电视机有问题，没有声音，图像模糊。你多次打电话给售后服务部，没有人来解决问题。写封信要求上门维修，或更换一台，或退货(refund)。任务：请你用英语写一封50字左右的投诉信。请用下面格式： Dear Sir yours sincerely

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A. beefB. dialogueC. zeroD. supperE. porkF. breakfastG. airmail It is the first meal of a day.

The box was so heavy that the little boy couldn’t lift it.The box was for the little boy to lift.

A. beefB. dialogueC. zeroD. supperE. porkF. breakfastG. airmail It is from pigs.

The population (人口) problem may be the (41) one of the world today. The world’s (42) is growing fast. Two thousand years ago, there were only 250 million people (43) the earth. Four hundred years ago, the number was (44) 500 million. But at the beginning of (45) century, the world’s population was about 1,700 million. In 1970, it was 3,600 million, and in 1990, 5,000 million. A (46) report says the world population will (47) 6,000 million by the end of the 20th century. This is just ten (48) after it (49) five thousand million. People say by the year 2010, (50) may be seven thousand million.

A. weeks B. months C. years