题目

采用以下哪一组方法，可以依次解决①～④中的遗传问题（ ） ①鉴定一只白羊是否纯种 ②在一对相对性状中区分显隐性 ③不断提高小麦抗病品种的纯合度 ④检验杂种子一代的遗传因子的组成． A．杂交、自交、测交、测交B．杂交、杂交、杂交、测交C．测交、杂交、自交、测交D．测交、测交、杂交、自交Jim, a successful businessman, told the experience of his childhood. When he was 12 years old, his parents died. He was alone and didn’t get on well with others. People always laughed at him. No one showed        to him. His only friend was a dog named Tige. He gave his dog enough to eat and drink, but sometimes he was not       to it. He didn’t know that an unkind word sometimes could cut one’s heart like a knife. One day as he walked down the street, a young lady was walking in front of him. One of her bags dropped from her arms. As she stopped to        , she dropped other bags. He came to help her. “Thank you, dear! You are a nice little boy!” She said kindly, smiling. A special feeling came to him. It was the first time that he had heard such kind words. He watched her      she went far away, and then he whistled（低语）to his dog and went directly to the river     . “Thanks, dear! You are a nice little boy!” He repeated what the woman said. Then in a low    he said to his dog, “You are a nice little dog.” Tige raised its ears as if it understood. “Hmm! Even a dog likes it!”he said. “Well, Tige, I won’t say anything unkind to you   .” Tige waved its tail happily. The boy thought and thought. Finally he looked at himself in the river. He saw      but a dirty boy. He washed his face carefully. Again he saw a       nice boy. He was amazed. From then on, he started a new life. After telling this, the businessman said, “This is the very place in which that kind woman planted the first seed of kindness in my heart.” What a great      it has! 1.A. kindness                        B. interest                      C. illness                            D. worries 2.A. exciting                                B. interesting                     C. strange               D. friendly 3.A. find it                                   B. pick it up                        C. look it up          D. give it up 4.A. until                             B. after                             C. since              D. because 5.A. far                                     B. nearby                         C. near               D. nearly 6.A. sound                               B. noise              C. voice                       D. hear 7.A. too                                    B. at all                             C. any long                      D. any more 8.A. anything                          B. nothing                        C. everything        D. something 9.A. clean                      B. dirty                          C. smiling               D. angry 10.A. present                                B. dream                               C. advice                               D. Power