PB1302配方选择加回收VCM时，至少加（）t。
A.2
B.3
C.1D510重量的20%
参考答案：A
用所给单词的正确形式填空。
1. Can you show (I) your book?
2. Where is she (go)?
3. You can see the library on the (two) floor.
4. —Where (be) your friends? —They (be) in the gym.
5. —What (be) this? —It's a pencil.
