题目

—How many monkeys did you see in the zoo? —The total monkeys there________ten, ________the newly-born ones. A.got to;included        B.came to;including C.reached;included          D.got;including   答案：B数字总计达到came to,including分词作状语，意思是“包括”。如图，长方体ABCD是折射率为1.5的玻璃砖，将其放在空气中，一束光以入射角θ射到AB面的P点上，AD=2AP，求：（1）要使此光束进入长方体后能直接折射到AD面上，θ的最小值是多少；（2）要使此光束直接折射到AD面上的光能在AD面上发生全反射，θ的取值范围是多少．