变异型心绞痛最好选用哪一种药物
A．普萘洛尔B．吲哚洛尔C．硝苯地平D．硝酸异山梨酯E．洛伐他汀
参考答案：C
If better use is ____ your spare time , you will make greater progress.
A．used for
B．spent
C．made of
D．taken
黄土高原水土流失自然因素是
①夏季多暴雨②黄土土质疏松③植被覆盖率低④春季多大风⑤本区地形起伏大⑥全年降水丰沛[ ]
A．①②⑥
B．②③⑤
C．①②③⑤
D．⑤⑥
