下列哪种药物在治疗梅毒或钩端螺旋体病时有可以发生赫氏反应
A.青霉素G
B.链霉素
C.四环素
D.多黏菌素
E.两性霉素
参考答案:A
偶函数f(x)=ax2-2bx+1在(-∞,0]上递增,比较f(a-2)与f(b+1)的大小关系[ ]
A.f(a-2)<f(b+1)
B.f(a-2)=f(b+1)
C.f(a-2)>f(b+1)
D.f(a-2)与f(b+1)大小关系不确定
(2013·烟台一模)After ________ seemed an endless wait, it was her turn to enter the interview room.
A.what
B.why
C.that
D.how