—What's the time now?
—It's _______ half past one. [ ]
A. much
B. about
C. many
D. at
答案:B
移栽植物时,常常去掉几片叶,其目的是为了[ ]
A.降低光合作用
B.减小呼吸作用
C.减少水分蒸腾作用
D.移栽方便
钢轨铝热焊焊缝距轨枕边不得小于()。