单项选择题

判断葡萄球菌有无致病性的标志之一是
A、乳糖试验
B、抗“O”试验
C、蔗糖试验
D、血浆凝固酶试验
E、胆汁溶菌试验

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多项选择题

鉴证业务按照提供的保证程度和鉴证对象的不同可分为（
A A审计业务
B B审阅业务
C C其他鉴证业务
D D相关服务业务

According to the author, the essential thing to do in order to keep a strong and healthy body is ____________.
A、 to build up good habits
B、 to increase resiliency of strong bones
C、to do excessive work and recreation
D、 to conform to standards of beauty

答案： to build up good habits