猪带绦虫的哪个阶段对人体危害最大（）
A.虫卵
B.囊尾蚴
C.成虫
D.裂头蚴
E.六钩蚴
参考答案：B
To our pleasure, his parents came to accept the fact ____. [ ]
A. at times
B. in time
C. on time
D. at a time
有利于改善复合树脂热膨胀系数应首选
A．瓷粉
B．二氧化硅
C．硅酸铝锂
D．钡、锶玻璃粉
