In each production lot for a certain toy, 25 percent of the toys are red and 75 percent of the toys are blue. Half the toys are size A and half are size B．If 10 out of a lot of 100 toys are red and size A, how many of the toys are blue and size B ？（）

A．15

B．25

C．30

D．35

E．40

以下不是"0.022"托槽优点的是（）。

A.托槽更小，患者更舒适

B.弓丝选择较多

C.治疗早期保持轻力

D.更适用于滑动法关闭拔牙间隙

E.与镍钛方丝配合，可使转矩充分表达而保持温和的力