单项选择题 In the US, baseball is still widely considered a national sport, although it lags behind football in popularity, it’s commonly referred as “America’s pastime”, which is also a popular game in Japan, Cuba and the Dominican Republic, and so on._________

判断题 最常见的诊断乳糖酶缺乏的方法叫做氢呼气试验。正确错误

多项选择题 人可能被感染新冠病毒的途径有哪些？ A.  通过咳嗽或打喷嚏在空气中传播B. 没有安全防护情况下与病人密切接触C. 触摸被污染的物体表面 , 然后用被污染的手触碰嘴巴、鼻子或眼睛等D. 接触到可疑的被感染的动物