问题
单项选择题
公认细胞遗传学的奠基人是（）
A.J·Lamarck
B.T·H·Morgan
C.G·J·Mendel
D.C·R·Darwin
答案
参考答案：B
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公认细胞遗传学的奠基人是（）
A.J·Lamarck
B.T·H·Morgan
C.G·J·Mendel
D.C·R·Darwin
参考答案：B
There was once a famous king whose name was Tamerlane. Like Alexander the Great, he _36__ to become the master of the whole world. So he raised a great _37__ and made war on other countries. He conquered(征服，打败） many kings and __38__ many cities. But at last his army was beaten; and Tamerlane escaped alone from the field of __39__ . For a long time he wandered in __40__ from place to place. His enemies were __41__ him. He was about to lose all hope. One day he was __42__ under a tree, thinking of his failure. He had now been a wanderer for twenty days. He couldn’t __43___ any longer. Suddenly he saw a small object climbing up the trunk (树干) of the tree. He looked more __44__ and saw it was an ant, __45__ a grain of wheat（麦粒）as large as itself. There was a __46__ in the tree only a little way above, and that was the home of the ant. “You are __47__, Mr. Ant,” he said, “but you are carrying something that is too heavy for you.” Just as he __48__, the ant lost its footing and fell to the ground. But it __49__ held on to the grain of wheat. Tamerlane _50__ the little insect. It tried the second time, the third time ... the twentieth time — but always with the same __51__. Then it tried the twenty-first time. __52__, one little step at a time, it climbed across the rough place where it had __53__ so often. The next minute it climbed __54__ into its home, carrying the grain of wheat. “Well done!” said Tamerlane, “you’ve taught me a lesson. I, too, will try, try again, __55__ I succeed.” And this he did.
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