问题
单项选择题
对于各种氟化物防龋方法的可行性，正确排列为（）
A.自来水氟化》学校口服氟片》学校饮水氟化
B.自来水氟化》家庭口服氟片》含氟牙膏
C.学校饮水氟水》含氟牙膏》涂氟
D.家庭口服氟片》涂氟》含氟牙膏
答案
参考答案：C
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对于各种氟化物防龋方法的可行性，正确排列为（）
A.自来水氟化》学校口服氟片》学校饮水氟化
B.自来水氟化》家庭口服氟片》含氟牙膏
C.学校饮水氟水》含氟牙膏》涂氟
D.家庭口服氟片》涂氟》含氟牙膏
参考答案：C
| 选择正确单词完成对话，将序号写在题前括号里。 |
| A: What are you 1 ? B: I'm making a birthday chart 2 our friends. When is your 3 ? B: 4 in March. A: Bill's birthday is in 5 , too. When is Mary's birthday? B: It's in July. A: There 6 three 7 in July. Ann's birthday is in July. Ben's birthday is in July, 8 . When is Lucy's birthday? B: 9 birthday is in October. A: Great! Here 10 the chart. |
( ) 1. A. do | B. doing B. to B. date B. Is B. May B. is B. birthdays B. to B. Her B. be | C. does C. four C. birthday C. It's C. June C. are C. months C. two C. My C. are |