Our waiter, who seemed to have a bad cold, kept coughing on our table as he took our ____. [ ]

A. offer

B. bill

C. order

D. menu

小明同学上初中后患了近视眼，使远处物体的像落在视网膜___________（选填“前”或“后”），而看不清远处物体。现在有一种治疗手术，采用激光对角膜进行处理，使晶状体和角膜构成的透镜对光的偏折能力变得_________（选填“强”或“弱”）些。