橘皮精油的主要成分及一般提取方法为( ) A．柠檬酸、萃取法 B．柠檬烯、压榨法 C．柠檬烯、水中蒸馏法
（06年江苏卷） 请阅读下面的文字，完成14―17题。一幅烟雨牛鹭图汤世杰一眼看见那幅大地上的水墨小品，我还真有些忘情；烟雨中一头头灰黑的水牛
一Everybody is going to climb the mountain. Can I go too, mum? — Wait till you are old enough, dear． A will you? B Why not? C I hope so
成书于战国晚期的《竹书纪年》，原书亡佚，后经清代学者辑佚整理成书。书中不少记载与正史不同，如“舜因尧于平阳，取之帝位”，与《史记》所
I break off a piece of candy and take pleasure in its sweet outside and the bitter, dark chocolate inside, thinking of my own life. Being raised by a single parent was a bitter-sweet 36 , which gav
______ made the teacher proud was __________ more than half of her students had been admitted to key universities. A. What; because B. What; that C. That; what D. That; because
被鲁迅誉为“史家之绝唱，无韵之离骚”的《史记》记述了我国古代 A．从商朝到唐朝时期的历史 B．从夏朝到三国时期的历史 C．从传说中的黄帝到汉
下列说法正确的是( )A.康普顿发现了电子B.卢瑟福提出了原子的核式结构模型C.贝克勒尔发现了铀和含铀矿物的天然放射现象D.伦琴发现了X射线
