问题
单项选择题
免疫对机体()
A.有利
B.有害
C.有利又有害
D.无利也无害
E.正常情况下有利,某些条件下有害
答案
参考答案:E
免疫对机体()
A.有利
B.有害
C.有利又有害
D.无利也无害
E.正常情况下有利,某些条件下有害
参考答案:E
读一读,选一选,填空。 | |
2. _____________ do you do that? Put the seeds in the soil. 3. _____________ are you going to do next week? I'm going to play football. 4. _____________ does water come from? 5. It _____________ from the clouds. 6. _____________ the seeds in the soil. |