问题 单项选择题

饮水的适宜氟浓度一般应保持在()

A.2.1~2.5mg/L

B.1.6~2.0mg/L

C.1.1~1.5mg/L

D.0.5~1.0mg/L

E.0.1~0.4mg/L

答案

参考答案:D

解析:饮水的适宜氟浓度一般应保持在0.7~1mg/L之内。故答案为D。

单项选择题 A1/A2型题
写作题

假定你是李华, 你们学校最近开展了创建“平安校园”的活动。你们班为此组织主题班会,请你就如何创建“平安校园”在班会上谈谈你的想法。发言应包括下面的内容:

1.安全意识的重要性;

2.校内潜在的一些人身安全隐患,如: 体育运动时,和同学发生矛盾时等情况。

3.你对解决这些问题的积极建议。

注意:

1.词数100左右;

2.文章开头已给出,不计入总词数。

注释: 校园安全: safety at school

My dear classmate,

Whether our school campus is a safe place to stay on means a lot to both teachers and students.______________________________________________________________________

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