造血细胞包括（）
A.多能造血细胞
B.多能造血干细胞
C.髓系干祖细胞
D.各期红系细胞
E.各期白系细胞
参考答案：A, B, C, D, E
Children who are not active or _______ diet is rich in fat will put on weight easily.
A．who
B．whose
C．that
D．which
