已知△ABC∽△A′B′C′，∠A=40°，∠B=60°，∠C′=（ ）° [ ]
A.40°
B.60°
C.80°
D.100°
答案：C
— ______ do you spell "pen", Frank?
— P-E-N, pen. [ ]
A. What
B. Which
C. How
胎盘循环停止后，回心血量( )
A．逐渐增加B．升高达高峰C．骤然增加D．骤然减少E．逐渐减少
