How much did the owner ask for the watch
A. Five hundred dollars.
B. Ten hundred dollars.
C. A hundred dollars.
结核菌素试验原理是()
A. Ⅲ型超敏反应
B. Ⅳ型超敏反应
C. Ⅰ型超敏反应
D. Ⅱ型超敏反应
E. 以上都不正确
______ you like to have dinner with us tonight
A. Would
B. Are
C. Do
下列( )传染病人是唯一的传染源
A. 恙虫病
B. 梅毒
C. 钩体病
D. 结核病
E. 以上都不是