使酚酞试液变红色的溶液，能使紫色石蕊试液（ ）
A．变红色
B．变蓝色
C．变无色
D．不变色
答案：B
﹣3的平方是（ ），平方等于1的数是（ ）
— He is eager to try something he has never tried before.
— Oh, I see. That's _____ he's different from others. [ ]
A. when
B. where
C. how
D. what
