请将图中三条入射光线经凸透镜折射后的折射光线画出.
—I'd love to travel all _____ the world.
写出近义词
傍晚—____ 常常—____ 飘舞—____
The kindhearted man，who thinks ________his duty to help poor people，is popular with many people who know him.
使函数fx=sin2x+θ+3cos2x+θ是奇函数，且在0,π4上是减函数的θ的一个值是（ ）
煤炭资源优越开发条件的叙述，不正确的是 ( )