期刊选题策划的具体要求有()。
A.针对性
B.前瞻性
C.可行性
D.商业性
E.时效性
参考答案:A, B, C
珠算6+7时,用的口决是______.
You may use room as you like ____ you clean it up afterwards.
A.so far as
B.so long as
C.in case
D.even if