小学语文教学有哪些规律？

          , I lost heart in English learning, but my teacher often said to me, "Keep on studying hard ,

and you'll succeed              ."  [ ]

A. At one time; in time                  

B. At one time; on time  

C. At a time; in time                    

D. At a time; on time

— How tall he is!

— Yes, he is _____ than any other student in his class. [ ]

A. tall

B. taller

D. tallest

“政府活动扩张法则”的提出者是( )。

A．皮考克

B．马斯格雷夫

C．瓦格纳

D．鲍莫尔

X、Y运动的垂直度是怎么保证的？

据不完全统计，海湾战争中美军共消耗各类物资1.7万余种、（）。

A、1000多万吨

B、2000多万吨

C、3000多万吨