M蛋白的鉴定和分型常用的方法是（）。 A.免疫固定电泳 B.对流免疫电泳 C.火箭免

The Post Office is Closed on November 25. Thursday, November 25, is a holiday. The post office will open again on Friday, November 26. Hours Monday ~Friday:              8:00 a.m. ~5:00 p.m. Saturday:                  9:00 a. m. -1:00 p.m. Sunday and Holidays:                 CLOSED

小题1:On Saturday, the post office is only open for        hours.
A. three                   B. four                   C, five
小题2:Why is the post office closed on November 25?
A. Because it's a holiday.  
B. Because it's a weekend.   
C. Because it' s Sunday.
小题3:If Mr. Black wants to send a letter at 8: 30 a.m., he can go to the post office on    .
A. Sunday, November 28   
B. Saturday, November 27  
C. Friday, November 26