有害作用的质反应剂量反应关系多呈S 型曲线,原因在于不同个体对外源性化学物的()
A、吸收速度差异
B、分布部位差异
C、代谢速度差异
D、排泄速度差异
E、易感性差异
参考答案:E
句型转换
1. 昨天他不得不早起床赶公共汽车。
He get up early to catch the bus yesterday.
2. 现在我必须做作业。
I do my homework now.
3. I had to get up early yesterday.(改为否定句)
I to get up early yesterday.
4. She has to clean the room every day. (改为否定句)
She to clean the room every day.
5. I can dance and sing. (改为否定句)
I dance sing.
6. The students can eat in the hallway.(改为一般疑问句)
the students in the hallway?
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