In my family _____three people. [ ]
A. have
B. has
C. there is
D. there are
答案:D
当x=2.5,y=1.4时,4x-2.8的值是______;3xy-y的值是______.
中国能成为联合国安理会常任理事国,其主要原因之一是中国长达八年的抗日战争为世界反法西斯战争的胜利作出了巨大贡献。 [ ]