只含有一类核酸的微生物是
A．螺旋体B．支原体C．细菌D．病毒E．立克次体
参考答案：B
Henry’s birthday is on _______ Saturday next month，but I don’t remember _______ date.
A．不填；the
B．a；a
C．a；the
D．the；the
---- Do you live in this city?
---- No, we ______ it for holidays.
A．just visit
B．just visited
C．are just visiting
D．have visited
