急性心梗合并左心衰给硝酸甘油的作用机制不是（）
A.降低左心室后负荷
B.降低左心室前负荷
C.降低心肌耗氧量
D.扩张冠状动脉
E.降低心率
参考答案：E
Which of the following is not a good habit to save water? [ ]
A. Reuse the water.
B. Water the flowers with waste water.
C. Often take a shower for long.
D. Sweep the floor with the dirty water.
下列关于叶绿体和线粒体的叙述，正确的是（）
A.线粒体和叶绿体均含有少量的DNA
B.叶绿体在光下和黑暗中均能合成ATP
C.细胞生命活动所需的ATP均来自线粒体
D.线粒体基质和叶绿体基质所含酶的种类相同
