问题
单项选择题
植物的单倍体应用于育种，其最主要的优势在于（）。
A.大大缩短育种年限
B.直接显示突变表型而被选择
C.通过诱导能产生纯合体
D.能产生较高的突变频率
答案
参考答案：B
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植物的单倍体应用于育种，其最主要的优势在于（）。
A.大大缩短育种年限
B.直接显示突变表型而被选择
C.通过诱导能产生纯合体
D.能产生较高的突变频率
参考答案：B
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| Once there was a very brilliant, creative and educated man. He gained much 1 while traveling throughout the world. Unfortunately he lost his legs and left arm in a tragic accident, leaving only a finger and thumb on his right hand. He became so 2 that he was afraid he would spend his life 3 and would no longer be able to use his life in a(n) 4 way. One day, he remembered how he had always loved getting 5 . He realized that he still had partial 6 of his right hand and could write with 7 . Then, he had an idea, "Why not write to other people who need encouragement?" He 8 where he could find those who could be encouraged if they read his letters. He thought of people in 9 . Many of them had hope of regaining their 10 . Others would keep feeling depressed and remain put away for the rest of their lives. He decided that he must try to 11 them. So he wrote to a prison ministry about sending letters to the prisoners. The prison minister replied that writing to the prisoners would be 12 . However, it would be against prison rules for the prisoners to write back. 13 with the intention, the man began sending 14 messages of God's love, hope, strength, and encouragement. He wrote twice a week, testing his strength and ability to the 15 . He poured his heart and soul into his words, 16 his experience,sense of humor, optimism, and faith. It was difficult to write those letters, especially without hope of any 17 . Frequently, he felt discouraged, wondering if anyone 18 read his letters. However, this was his 19 chance, so he determined to continue. At last, he received a letter from the prison officer, which said, "Please write on the best paper you can afford. Your letters are passed from cell (小牢房) to cell until they almost fall to 20 !" We all have unique experiences, abilities and talents. We can discover ways to reach others in need of encouragement and strength. | ||||
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