咖啡因在苯甲酸钠的存在下溶解度由1：50增至1：1是由于（）
A.增溶
B.防腐
C.乳化
D.助悬
E.助溶
参考答案：E
The teacher ________ my mobile phone because I used it in class. [ ]
A. took out
B. took away
C. took off
D. took place
冷菜香味的产生和感知阶段在（）。
A.咀嚼时
B.入口时
C.吞咽时
D.高温时
