阿普加评分以______最灵敏，______为基础，______是最终消失的指标。

Jerome wrote each of the integers 1 through 20, inclusive, on a separate index card. He placed the cards in a box, then drew cards one at a time randomly from the box, without returning the cards he had already drawn to the box. In order to ensure that the sum of all the cards he drew was even, how many cards did Jerome have to draw ？（）

A.19

B.12

C.11

D.10

E.3

Everyone except Scott and Alan ____________there when the sports meeting began.[ ]

A. is  

B. are  

C. was  

D. were

资金账户是投资者用于证券交易资金清算的专用账户。( )

金属材料通常分为黑色金属和有色金属两大类。

OBA的光输出连接器后面光纤上的参考点与OPA的光输入连接器前面光纤上的参考点分别是指（）

A.MPI-S：MPI-R

B.MPI-R：MPI-S

C.S’：R’

D.R’：S’