题目

________to attend the memorial meeting? A. Shall we ask             B. Shall we be asking       C. shall we be asked      D. Shall be we asked 答案：C宁静、清澈的湖面是天然的____镜，桥在水中的倒影就是湖面上桥的____像（选填“实”或“虚”）.有一束入射光线与镜面的夹角是30°，若使入射角增大10°，则反射角为____.