单选题：How did the researchers test their volunteers?

题目分类：卫生类
题目类型：单选题
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题目内容：

How did the researchers test their volunteers? A．By giving everyone nasal drops containing either a cold virus or a particular flu virus
B．By givmg everyone medicine that help lessen the probability of catching cold
C．By giving everyone an injection boosting immune function
D．Bv investigating everyone's characteristics，interests and hobbie

参考答案：

答案解析：

出纳人员不得负责收入、费用、债权债务等账目的登记工作，但可以兼管会计档案保管。（　　）

出纳人员不得负责收入、费用、债权债务等账目的登记工作，但可以兼管会计档案保管。（　　）

分类：卫生类题型：单选题

账户的简单格式分为左右两方，其中，左方表示增加，右方表示减少。（　　）

账户的简单格式分为左右两方，其中，左方表示增加，右方表示减少。（　　）

分类：卫生类题型：单选题

What a role do lymphocytes play in the human body?

What a role do lymphocytes play in the human body?A．To reduce the rate of dying

分类：卫生类题型：单选题

So far there have nol：been definite data to confirm______

So far there have nol：been definite data to confirm______

分类：卫生类题型：单选题

People who take regular afternoon naps______

People who take regular afternoon naps______

分类：卫生类题型：单选题