I like skirts, ____________ I don't like shorts.[ ]
A. and
B. too
C. but
D. either
答案:C
Without the air to hold some of the sun’s heat, the earth at night_____very cold, too cold for us to live.
A.will be
B.would have been
C.is
D.would be
对铜绿假单胞菌进行鉴定时下列哪项说法有误()
A.分解尿素
B.氧化酶试验阳性
C.触酶试验阳性
D.能液化明胶
E.O/F试验为产碱型