问题
填空题
管理人员从一池塘内捞出30条鱼，做上标记后放回池塘。10天后，又从池塘内捞出50条鱼，其中有标记的有2条。根据以上数据可以估计该池塘内共有（ ）条鱼。
答案
750
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管理人员从一池塘内捞出30条鱼，做上标记后放回池塘。10天后，又从池塘内捞出50条鱼，其中有标记的有2条。根据以上数据可以估计该池塘内共有（ ）条鱼。
750
请先阅读短文，然后根据其内容选择单词的正确形式填空，每词限用一次。
Jiu, a second-year junior student 3 Fujian, could not understand his teacher and was doing 4 in his lesson. He became so worried about it 5 he started to cut his fingers(手指) with a knife. Another student, 14-year-old , from Guangzhou, was 6 of exams. She got very worried , and 7 she looked at the exam paper, she couldn’t think of ___8_ to write. Many students won’t ask for help. Some think they will look stupid if they go to see a 9 . Others don’t want to talk about their secrets. An expert on teenagers has the following 10 for teens: Talk to your parents or teachers often. Take part in group activities and play sports. Go to see a doctor if you feel unhappy or unwell. |