水仙花中鲜黄色杯状物为（）。
A.副萼
B.副花冠
C.花冠
D.蜜腺
参考答案：B
This monument was built in honor of the scientist who was believed ______ the first telephone.
A．to invent
B．to have been invented
C．to have invented
D．having been invented
真空高温条件下金属基底上制作的金属-烤瓷复合结构的全冠
A．嵌体B．半冠C．烤瓷熔附金属全冠D．桩冠E．3/4冠
