问题
选择题
动物细胞融合的目的中，最重要的是[ ]
A．克服远缘杂交不亲和的障碍
B．制备单克隆抗体
C．培育新物种
D．生产杂种细胞
答案
答案：B
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动物细胞融合的目的中，最重要的是[ ]
A．克服远缘杂交不亲和的障碍
B．制备单克隆抗体
C．培育新物种
D．生产杂种细胞
答案：B
It was a Sunday afternoon. It was very____and nobody wanted to stay at home. Mike decided to go swimming in the river. His brother, Jim, wanted to go with him. "____him with you, Mike," said their father. "He will do what you say, I think." They got____the river quickly. A lot of people were____in it. Mike told Jim to play on the bank, then he____into the water. About an hour later, Mike swam to the bank with a fish in his hand. Jim was very____. He found a bottle and put the fish in it. Jim did____except watch the fish that evening. Suddenly Mike heard Jim____in the room. He ran to him and asked, "What's wrong____you, Jim?" "The fish has died (死了)." Jim said, "I thought it was____. So I took it out of the bottle and put it on the chair. I only wanted it to have a rest."
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