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【单选题】
欲制备稳定的乳剂必须加入A.
乳化剂
B.
抗氧剂
C.
着色剂
D.
防腐剂
E.
助悬剂
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】听力原文：W: How long does it take you to get to work? M: It's only a fifteen minute bus drive early in the morning but coming home from work is quite different it takes at least twenty or thirty minutes. ...
A.
15 minutes.
B.
45 minutes.
C.
35 minutes.
D.
30 minutes.
【单选题】听力原文：M: How come David is always so full of energy? W: He has a strange but highly effective way of sleeping. M: What is that? W: He takes a short sleep for an hour every six hours and has a total of ...
A.
It's effective.
B.
It's strange.
C.
It's the best.
【单选题】The boy is made__ the room every day. A. clean B. cleaning C. to clean D. cleans
A.
clean
B.
cleaning
C.
to clean
D.
cleans
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