水泥进场批号的确定除数量外还有A+连续进场，同一生产厂、同一等级、同一品种、同一批号且连续进场的水泥，袋装不超过()，散装不超过()，每批抽样不少于一次。
I______the meeting yesterday, but some urgent matter prevented me from coming.
A. ought to attend
B. was about to attend
C. was to have attended
D. was to attend
We may learn from paragraph 2 that it centers on______.
A. the causes of the America"s economic expansion
B. the stimulative monetary and fiscal policies
C. the restoration of sounder liquidity positions
D. the President"s economic policy moves
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