【单选题】【消耗次数:1】
It was not until she had arrived home __________ remembered her appointment with the doctor.
when she
that she
and she
she
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【单选题】 It was not until she had finished all her work_____.
①  did she return
②  that she returned
③  when she returned
④  that did she return
【判断题】 She had her finger cut when she is paper-cutting.
①  正确
②  错误
【单选题】 She resorted to ____ when she had no money to buy foods for her children.
①  have stolen
②  steal
③  stole
④  stealing
【单选题】 She resorted to _____ when she had no money to buy foods for her children.
①  have stolen
②  steal
③  stole
④  stealing
【单选题】 When she was criticized, she claimed that it was outside her _____of responsibility.
①  field
②  limit
③  extent
④  range
【单选题】 Lindas parents died when she was a baby, and she was __________ by her aunt.
①  turned into
②  raised up
③  grown up
④  brought up
【单选题】 When she saw the clouds, she went back to the house to ____ her umbrella.
①  bring
②  fetch
③  take
④  carry
【单选题】 Although she wrote a lot of short stories and poems when she was very young, _____she was twenty five.
①  her first real success did not come until
②  her real first success came until not
③  since her first real success did not come until
④  not until her first real success
【单选题】 Although she wrote a lot of short stories and poems when she was very young, ____ she was twenty five.
①  her first real success did not come until
②  her real first success came until not
③  since her first real success did not come until
④  not until her first real success
【单选题】 _______ she tried her best, she didn’t succeed.
①  Though
②  When
③  If
④  After
随机题目
【单选题】 苦杏仁苷酶水解的最终产物包括
①  葡萄糖、氢氰酸、苯甲醛
②  龙胆双糖、氢氰酸、苯甲醛
③  野樱苷、葡萄糖
④  苯羟乙腈、葡萄糖
⑤  苯羟乙腈、龙胆双糖
【多选题】 煎煮法适宜使用的器皿是
①  不锈钢器
②  陶器
③  瓷器
④  铁器
⑤  砂器
【多选题】 常用溶剂中不能与水完全混溶的溶剂是
①  乙醇
②  丙酮
③  乙醚
④  正丁醇
⑤  氯仿
【多选题】 一般情况下,认为是有效成分的是
①  生物碱
②  叶绿素
③  多糖
④  黄酮
⑤  皂苷
【多选题】 用水蒸气蒸馏法提取中药化学成分,要求此类成分
①  能与水反应
②  易溶于水
③  具挥发性
④  热稳定性好
⑤  极性较大
【多选题】 下列关于有效成分的描述错误的是
①  需要提纯的成分
②  含量高的成分
③  一种单体化合物
④  具有生物活性的成分
⑤  具有生物活性的提取物
【单选题】 连续回流提取法与回流提取法相比,其优越性是
①  节省时间且效率高
②  节省溶剂且效率高
③  受热时间短
④  提取装置简单
⑤  提取量较大
【单选题】 从中药中提取化学成分最常用的方法是
①  溶剂法
②  蒸馏法
③  升华法
④  分馏法
⑤  超临界萃取法
【单选题】 不易溶于水的成分是
①  生物碱盐
②  苷元
③  鞣质
④  蛋白质
⑤  树胶
【单选题】 下列各组溶剂,按极性大小排列,正确的是
①  水>丙酮>甲醇
②  乙醇>醋酸乙脂>乙醚
③  乙醇>甲醇>醋酸乙脂
④  丙酮>乙醇>甲醇
⑤  苯>乙醚>甲醇