口腔健康教育和口腔健康促进结合起来可以()。
A.开展集体刷牙
B.公共饮水加氟
C.定期口腔健康检查
D.实施窝沟封闭
E.进行以上各项
参考答案:E
Look! Jack and his monkey _________ flying disk together in the garden.
A.is playing
B.was playing
C.are playing
D.were playing
黄大豆种子 ( )
A.10
B.5
C.19
D.20