题目

在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密，每处不超过15个字。研究遗传基因可能带来重大科学突破，普及优生知识会产生巨大社会效益。我们不好比较这些贡献或影响的大小，因为学科不同，特别是基础理论和应用技术存在差别， ① 。但是，无论从事何种学科专业的科学工作者都不应忘记科学普及的责任，而且似乎没有无法普及的科学。爱因斯坦的相对论非常艰涩难懂，据说解释相对论的文章比相对The date was like any other day in his life. After school David walked past the shop on the street corner. He stopped to look at the front row of shoes, and he felt sorry for himself. He really wanted to have a new pair for his birthday. He sadly walked away and thought of how to tell his mother. He knew she would give him anything if she could. But he also knew very well she had little money. He decided not to go home at once, as he looked worried and he didn’t want to make his mother worry about it. So he went to the park and there he sat on the grass. Then he saw a girl in a wheel chair. He found that the girl moved the wheels with her hands. David looked at her carefully and was surprised to see that the girl had no feet. He looked down at his own feet. “It is much better to be without shoes than without feet.” It was not right for him to feel so sorry and sad. He went away and smiled, thinking he was luckier in life.1.David was so sorry that ____A. he walked past the shoe shop.B. he forgot bring any money with him.C. his mother couldn’t buy him a pair of shoes.D. the shoes in the shop were not the right size for him.2.From the story we know that ________.A. David’s mother has much money.B. David’s mother wouldn’t buy him anything.C. David’s mother was a kind-hearted woman.D. David’s mother often bought presents for David’s birthday.3.David didn’t go home at once ________.A. because his mother was at work.B. because he wanted to sit on the grass in the park.C. because his mother wouldn’t give him any money.D. because he didn’t want to give his mother any trouble.4.In the park, David saw a girl________.A. without feet. B. without hands.C. walking slowly. D. looking down at his shoes.5.At last David ________.A. left the park sadly.B. decided to buy a new pair of shoes.C. didn’t know what to do with his old shoes.D. thought he’s more lucky than the girl in the wheelchair