答案:B
Right now, lots of people search for products on the Internet but still buy them at stores. Internet shopping will really ____ when people are sure that it is safe.
A.set up
B.set off
C.take off
D.take up
下列哪项属于渐进镜的缺点()
A.无像跳
B.中近距离视野缩小
C.配戴者需要更多的垂直转动眼位
D.视觉更接近于老视初期者
E.曲线效果