下颌义齿基托后缘应伸展至（）
A.磨牙后垫前缘
B.磨牙后垫前1／3
C.磨牙后垫前1／2或后缘
D.磨牙后垫可不考虑
E.均可
参考答案：C
To some people, happiness is __________ by family and friends, while to others, it means ___________ success.
A．being surrounded ; achieving
B．being surrounded ; to achieve
C．to surround ; achieving
D．surrounding ; to achieve
如图，《武则天秘史》正在热播，如果让你来评价武则天，你会说
A．贞观之治
B．贞观遗风
C．开元盛世
D．康乾盛世
