从挥发油乙醚液中分离得到下列成分，应加入：酸性成分（）
A. Na，SO3
B. 1%HCl或H2SO4
C. Girard T或P
D. 丙二酸单酰氯
E. 2%NaOH
查看答案
What are the speakers going to do this weekend
A. Go to the beach.
B. Climb a mountain.
C. Go for a bicycle-ride.
What is the woman good at
A. Swimming.
B. Running.
C. Playing.
What can we learn about the woman from the dialogue
A. She took part in one of the Olympic Games.
B. She still swims for international competitions.
C. She used to swim thirty five miles every week.
What do we know about the woman
A. She was in charge of a school.
B. She succeeded in dancing.
C. She has left her job.
微信支付 
支付宝支付