长期吸食或注射毒品会危及人体健康，下列各组中都属于毒品的是()
①冰毒、杜冷丁②海洛因、黄连素③大麻、摇头丸④黄曲霉素、尼古丁
-Whoknowswhatpandasandsheeplikeeating?
-Iknowpandaslikeeating_______andsheeplikeeatinggrass.
下列物质化学式书写正确的是()
---HowwasyourvacationinShanghai?
---Oh,__________,Ican’tstandit.Thereweretoomanypeopleandtheweatherwastoohot.
√4的算术平方根为_________。
