题目

下列关于地球公转的叙述,正确的是 A. 地球公转方向是自西向东            B. 1 月初,地球位于公转轨道近日点上,运动速度较慢 C. 公转轨道是椭圆，太阳位于椭圆中心  D. 地球公转轨道是个扁率很大的椭圆 答案：A 解析: 略It says every scientist cherishes a childhood dream indicating his or her future success. But for Yuan Longping,dubbed (外号;) as " father of hybrid rice”，the dream is that he cultivates rice as plump as peanuts,1       Yuan won a 5 million yuan State Supreme Science and Technology Award today,known as the Nobel Prize in China,for his outstanding achievements in breeding highyield hybrid rice,2       Yuan came up with the idea of hybridizing rice for the first time in the world in 1960s. Since then,50 percent of China's total rice cultivation fields have grown such rice,3       .Wrinkles grown on his sunburnt face,a slim figure and coiledup (向上卷的) trousers legs would confuse foreign reporters who came to interview the most famous scientist in China,who would rather be called "a farmer".The urbanite-turned-farmer graduated from Southwest Agriculture College in 1953 has his name related to the world's most advanced agricultural technology. Four minor planets,a listed seed company and a science college in China were named after him,4       .By lending his name to the Longping Hightech,a seed company,Yuan obtained a 5 percent stake,or 2. 5 million shares worth 2 million yuan,in the firm.However,Yuan said his research requires the lifestyle of a farmer,or rather a migrating farmer,as he has conducted extensive research related to the cultivation of new strains of hybrid rice " Super Hybrid Rice" in some 10  provinces.The "Super Rice" yields are 30 percent higher than those of common rice. The record yield of 17,055 kilograms per hectare was registered in Yongsheng County in Yunnan in 1999.5          He has a dream,more realistic than that of his young age,that popularizing new strains of grain with higher yields around the world,can eliminate starvation on earth.   A. which is considered to be the best way to increase the world's grain output   B. But even after that achievement Yuan won't take a break.   C. This is his motivation to stimulate his research.   D. and farmers can relax in the cool shadow of big rice plants   E. wiiich were the first time that a Chinese scientist's name is valued for its intellectual assets   F. which has substantially increased China's grain output   G. which added some 300 billion kilograms to the country's grain output1.                  2.                  3.         ____ 4.          5.