选择题：影响健康的因素成千上万，但归纳起来主要有（ ）四大类。A.生活方式／行为因素B.环境因素C.健康服务

下列关于危险因素的表述，正确的有（ ）A.预防慢性病的最好方法是改善生活方式，减少导致这些慢性病的危险因素。B.健康危险因素是健康风险评估的依据，按是否可以纠正

In my point of view, the best way to keep ____ is to go in for sports.A)properB)

下列的道德规范能对护士的行为可以起到评价和激励作用的是( ）。

Teachers might consider ways of making classrooms less distracting and more ____

Some kinds of birds which were once a(n)______ sight are now becoming rare.A)che