下列物质中属于碱的是
A.CH4(甲烷)
B.CH3COOH(醋酸)
C.H2SO4
D.KOH
答案:D
A为有机物;B、C均为酸;
成活率一定,成活的棵数与植树总棵数______比例.
—You can’t stand working with Jane in the same office, can you?
—______,because she just refuses _______while working.
A.No, to stop talking
B.Yes ,to stop talking
C.No, stopping to talk
D.Yes, stopping talking