下列疾病中，不属于遗传病的是（ ）
A．先天性裂唇
B．色盲
C．血友病
D．艾滋病
答案：D
一质点由A点自由下落，经过B点到达C点，已知vB=0.6vC，sBC=80m，求AC间距离？
The price system is a complex network composed of the prices of all the products bought and sold in the economy as well as ________ of a great number of services. [ ]
A. the one
B. those
C. ones
D. that
