One way for students to prevent H7N9 flu virus is to open the windows of the classroom to allow the air to .
A. accumulate
B. circulate
C. illustrate
D. accelerate
网友回答
A. accumulate
(答案→)B. circulate
C. illustrate
D. accelerate
解析：句意：对学生而言，阻止H7N9流感病毒的一种方法就是打开教室的窗户，让空气流通。Accumulat积累；circulate循环；illustrate 阐明、图解；accelerate 加速。
考点: 考查动词的用法。