_________ the right kind of training, these teenage soccer players may one day grow into the international stars.

A．Giving

B．Having given

C．To give

D．Given

骨质疏松症患者在骨量丢失30%以上时，X线才能有阳性所见。以下不是其X线特点的是（）

A.骨皮质变厚

B.骨结构模糊

C.骨小梁减少或消失

D.骨小梁的间隙增宽

E.椎体双凹变形或前缘塌陷呈楔形变