问题
单项选择题 A型题
下面关于砷对食品污染及其毒性表述错误的是（）
A.主要来源于农药及工业三废
B.毒性强弱与其存在形式有关
C.毒性强弱与其价态有关
D.有机砷毒性大于无机砷
E.急性砷中毒主要是胃肠炎症状
答案
参考答案：D
解析：无机砷的毒性大于有机砷，所以D是错误的，其余表述均正确。
搜题请搜索小程序“爱下问搜题”
下面关于砷对食品污染及其毒性表述错误的是（）
A.主要来源于农药及工业三废
B.毒性强弱与其存在形式有关
C.毒性强弱与其价态有关
D.有机砷毒性大于无机砷
E.急性砷中毒主要是胃肠炎症状
参考答案：D
解析：无机砷的毒性大于有机砷，所以D是错误的，其余表述均正确。
综合填空。(10分)
Food and clothing are very important for us. We can’t leave them in our life. As we know, food gives us energy. We must have 小题1: food to keep us healthy. If we choose the right food, we can have healthy 小题2: habits. We should eat more fruits and vegetables instead of biscuits, hamburgers, Beijing Roast Duck and so on. We should eat 小题3: snacks and candies. Different food helps us in different ways. We should have different 小题4: of food, such as fruits, vegetables, grain, eggs, milk, meat, fish and so on. Besides, we should exercise more often, so we can become much 小题5: . Different jobs require different clothes. We are middle school students. I think we should wear school 小题6: at school every day, especially at school meetings, because suitable uniforms can not only 小题7: good discipline but also make us happy. I think they can even make us 小题8: much harder. Moreover school uniforms are cheaper than casual clothes. Clothes in fashion cost too much. We cannot 小题9: them. So I think we should wear them at school 小题10: on holidays. |