A. come to power B. came to power

　　C. are in power

　　D. have been in power

　　14. (2017·兰州模拟)Television has many advantages. It keeps us　about thenews and also provides entertainment in the house.

　　A. informed; latest

　　B. to know; later

　　C. learning; later

　　D. to think; latest

　　15. If you ring the doorbell when visiting our home, you　by our dog.

　　A. will be greeted B. will greet

　　C. were greeted

　　D. greeted

　　Ⅱ. 阅读理解Linus Pauling, the only person who has won two undivided Nobel Prizes, was born in Portland, Oregon. He attended Washington High School but because of an unimportant detail he did not receive his diploma until 1962, long after he had received his Bachelor’s degree in chemical engineering from Oregon State College in 1922. He had chosen to study his major because he could get a good job with it.

　　He won the Nobel Prize for Chemistry in 1954 for his research into the nature of the chemical bond and its application to the explanation of the structure of complex substance. His interest in the “behavior” of molecules(分子)led him from physical chemistry to biological chemistry, especially of the human body. He began with proteins and their main parts, the amino acids(氨基酸), which are called the “building blocks of life”. In 1950, he constructed the first satisfactory model of a protein molecule, a discovery very important to the understanding of the living cell.

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