患者，女，54岁，因体位改变时眩晕发作2周就诊。近2周来，无明显诱因发生躺下时短暂旋转性眩晕发作，伴有恶心，眩晕发作时无意识障碍、无黑矇、无肢体麻木等就诊。

该患者就诊时，还需要补充哪些病史（）

A.眩晕持续时间

B.听力情况

C.眩晕诱发体位及缓解体位

D.耳鸣情况

E.既往外伤手术史

F.以上都不是

Questions 17 to 20 based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage.

hat is the percentage of the sugar used as food

A．19%.

B．90%.

C．10%.

D．30%.