问题
选择题
A survey of the opinions of experts that three hours of outdoor exercise a week good for one’s health.
A．show; are
B．shows; is
C．show; is
D．shows; are
答案
答案：B
这题考查主谓一致，第一空的主语是：A survey of the opinions of experts，中心词是a survey，谓语是单数，第二空的主语是three hours of outdoor exercise，中心词是outdoor exercise，所以谓语是单数。选B。