属于社区人群预防冠心病的二级预防的是()
A.控制原发疾病,预防高血压
B.改善饮食结构
C.社区人群的监测和发病筛选
D.功能恢复
E.改变不良生活习惯
参考答案:C
下列哪一项不是种群 [ ]
A.广西乐业天杭中的方竹
B.某一池塘中全部的蝌蚪
C.大兴安岭的东北虎
D.某一个森林中的猫头鹰
—I wonder _______ like to be an astronaut (宇航员).
—I don't know, but I imagine it's exciting. [ ]
A. what is it
B. what it is
C. whether is it
D. whether it is