在等腰梯形ABCD中,∠A:∠B:∠C:∠D可能是 [ ]
A.1:2:1:2
B.1:1:2:2
C.1:2:3:4
D.1:4:2:3
答案:B
— Morning, boys and girls! Please try your best in today’s exam! Good luck to all of you!
— ________
A.Sorry, I won’t.
B.Never mind .
C.Thanks!
D.Congratulations!
一部书稿,甲、乙两个打字员需20天完成,两人合打了8天后,余下的书稿由乙单独打。若这部书稿由甲单独打需28天完成,问乙又干了几天才完成?()
A.32
B.76
C.42
D.84