甲、乙、丙、丁4个人站成一横排,若甲必须站在乙左边,则共有站法(用数字作答)______种.
参考答案:L
小题1: Her __________ (雄心, 野心) is to become part of the national team for the next Paralympic Games
小题2:Claire thought it was ridiculous to be offered ______________ (同情心) by a robot.
小题3:As he was not allowed to ___________ (陪伴;伴奏) her to the shops, he wrote out a list of items for her.
小题4:As a ________________ (恩惠;喜爱) Tony promised to help Claire make herself smarter and her home more elegant.
小题5:In 1942 he joined the staff of the Philadelphia Navy Yard as a __________ (较年幼的,地位低的) chemist.
小题6:It was when Asimov was eleven years old that his ___________ (才干,特殊能力) for writing became obvious.
小题7:Soon after his ______________ (离婚) in 1973, Asimove married again.
小题8:I could see he was terrified of being ______________ (遗弃,抛弃) by us.
小题9:I’m sitting in the warm night air with a cold drink in my hand and _______ (反射;思考) on the day.
小题10:Without ____________ (暂停) we jumped into the boat with the other whales and headed out into the bay.
美国化学家R.F.Heck因发现如下Heck反应获得2010年诺贝尔化学奖。
(X为卤原子,R为取代基)
经由Heck反应合成M(一种防晒剂)的路线如下:
回答下列问题:
(1)M可发生的反应类型是______(填序号)。
a.取代反应 b.酯化反应 c.缩聚反应 d.加成反应
(2)C与浓H2SO4共热生成F,F能使酸性KMnO4溶液褪色,F的结构简式是______。D在一定条件下反应生成高分子化合物G,G的结构简式是______。
(3)在A→B的反应中,检验A是否反应完全的试剂是______(填试剂名称)。
(4)E的一种同分异构体K符合下列条件:苯环上有两个取代基且苯环上只有两种不同化学环境的氢,与FeCl3溶液作用显紫色,K与过量NaOH溶液共热,发生反应的方程为______。