一个数的相反数是﹣2016，则这个数是（ ）
人类要想探索在月球上生存，必须具有（ ）
①水
②空气
③光
④土壤
⑤营养物质
根尖根毛区最主要的形态结构特征是（ ）
完型填空
1 is an American girl. 2 name is Helen. And this is Mike. 3 is an English boy. Mike can 4 his name. Kate can sing ABC song. Mike's home phone number is 658-4323. He can5Kate at 954-3643. They6friends now.
