问题
多项选择题
具有细胞毒杀伤作用的免疫细胞有（）
A.自然杀伤细胞
B.辅助性T细胞
C.细胞毒性T细胞
D.巨噬细胞
E.树突状细胞
答案
参考答案：A, C
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具有细胞毒杀伤作用的免疫细胞有（）
A.自然杀伤细胞
B.辅助性T细胞
C.细胞毒性T细胞
D.巨噬细胞
E.树突状细胞
参考答案：A, C
| 根据句意，从方框中选择合适的单词并用其适当形式填空。 | |
—It's on the _____ floor, next to my bedroom. 2. There are two _____ in my study. There are many books on them. 3. Children like _____ TV a lot. But it is not good for their eyes. 4. There _____ a knife, a pen and two pencils in the box. 5. Our math teacher often _____ his keys in the drawer |