问题
单项选择题
下列金属解毒剂中，对铅中毒疗效最好的是
A．二巯基丙醇
B．二巯基丁二酸钠
C．依地酸钙钠
D．硫代硫酸钠
E．亚甲蓝
答案
参考答案：C
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下列金属解毒剂中，对铅中毒疗效最好的是
A．二巯基丙醇
B．二巯基丁二酸钠
C．依地酸钙钠
D．硫代硫酸钠
E．亚甲蓝
参考答案：C
| 选词填空。根据短文内容，从方框中选择适当的选项完成短文。(有两个选项是多余的) | |
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| Once a king was walking around a pool with his ministers (大臣). Suddenly, he came up with (想出) an idea. He asked, "How many baskets of 1. are there in the pool?" The ministers couldn't give an answer. The king was angry, "You 2. answer my questions in three days!" Three days passed, but 3. of the ministers had the answer. Just then, a child said that he knew it. The king 4. the ministers to lead the child to the pool. To his surprise, the child 5. and said with a smile, "It is 6. . None needs to go to the pool." This made the king pleased. "All right! Let us know 7. it is." The child said, "If you know the 8. of the basket,the answer is known. 9. it is as big as the pool, there is one basket of water; half as big, two baskets…" "Stop! That's it. You have got the answer. They were thinking of things 10. a wrong way." Sometimes to get out of the difficulty, one must change one's way of thinking. |