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问题
判断题
轻金属离子如Na＋、K＋等有甜味。
答案
参考答案：错
选择题
The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her.
A. before
B. until
C. as
D. since
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单项选择题
类癌综合征病人术中除哪项外可引起类癌活性物质增加（）
A.手术挤压肿瘤
B.变动体位
C.过度通气
D.C0
2
蓄积
E.低血压
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