患儿，7岁，右下第一恒磨牙萌出2/3，右下第二乳磨牙早失，选用下列哪种保持器更好（）

已知：线段AC和BC在同一条直线上，如果AC=5.4cm，BC=3.6cm，线段AC和BC中点间的距离是 _________ ．

2006年，日本出台《食品安全基本法》。

对幼花、幼果具有保护作用的是（）。

A.花萼

B.花冠

C.雄蕊

D.雌蕊

辛热，有大毒，能峻下冷积的药物是

A．甘遂

B．巴豆

C．大戟

D．大黄

E．芫花

What does the speaker mean a. June Allyson’s movie career gradually declined as she began to appear on TV. b. The frustration in the movie industry was one of the reasons that June Allyson turned to TV business. c. June Allyson gradually lost her interest in movie after she got top ranking in the film box office. d. June Allyson tended to challenge the TV business after she got top ranking in the film box office.