比的前项和后项同时乘5，比值不变．______．（判断对错）
根据比的基本性质，比的前项和后项同时乘5倍，比值不变的说法是正确的．
故答案为：√．
-----John hit me, Mum!
------__________. You shouldn’ t have been that rude to him.
A．You are as strong as a horse
B．Forget it
C．You are as cool as a cucumber
D．It serves you right
细胞免疫是抗肿瘤免疫的重要机制，参与抗肿瘤细胞免疫的细胞主要有（）。
A.T细胞
B.巨噬细胞
C.NK细胞
D.树突状细胞
E.以上均是
