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搜题/搜资源
【单选题】【消耗次数:1】
It was not until she had arrived home __________ remembered her appointment with the doctor.
①
when she
②
that she
③
and she
④
she
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相关题目
【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
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【判断题】
She had her finger cut when she is paper-cutting.
①
正确
②
错误
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【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
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【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
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【单选题】
When she was criticized, she claimed that it was outside her _____of responsibility.
①
field
②
limit
③
extent
④
range
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【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
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【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
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【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
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【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
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【单选题】
_______ she tried her best, she didn’t succeed.
①
Though
②
When
③
If
④
After
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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
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【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
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【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
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【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
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【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
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【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
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【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
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【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
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【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
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【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
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