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【单选题】
高效液相色谱法最常用的检测器是A.
电化学检测器
B.
紫外检测器
C.
荧光检测器
D.
示差折光检测器
E.
蒸发光散射检测器
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【单选题】When did you go to see the doctor?
A.
This morning.
B.
Since yesterday.
C.
I am sure I will be all right soon.
D.
I've got the flu.
【单选题】-When did you go to the States? -I remember ________ there when I was ten.
A.
having taken
B.
to be taken
C.
being taken
D.
to take
【单选题】–Could you please tell me _______? –Sure. Park it right here.
A.
when did you go to the park
B.
when you went to the park
C.
where I can park my car
D.
where can I park my car
【单选题】节气指二十四时节和气候，是中国古代订立的一种用来指导农事的补充历法，是中国古代汉族劳动人民长期经验的积累和智慧的结晶，是我国劳动人民独创的文化遗产，对指导农业生产和指示气候变化有重要作用，下列有关节气的说法错误的是（）
A.
就绿茶而言，明前茶是茶中的极品，雨前茶是茶中的上品，雨前茶即雨水节气前采制的用细嫩芽尖制成的茶叶。
B.
芒种节气一到，我国长江中下游地区将进入多雨的黄梅时节，所以人们就开始了常说的“三夏”大忙季节，即指忙于夏收、夏种和春播作物的夏管。
C.
处暑节气在立秋和白露之间，意思是炎热的夏天即将过去了，但此时，南方地区经常会受到所谓“秋老虎”的困扰。
D.
冬至是中国农历中一个非常重要的节气，也是中华民族的传统节日、我国很多地区在冬至这一天有祭天祭祖的习俗。
【单选题】— When did you go to bed last night? — Very late. I didn't go to bed _____ my father came back. [ ]
A.
until
B.
since
C.
while
D.
after
【单选题】--When did you go to bed last night? --I didn't go to bed _____my father got home. [ ]
A.
until
B.
while
C.
after
【单选题】—When did you go to the United States? -- I remember _______ there when I was ten.
A.
having taken
B.
to be taken
C.
being taken
D.
to take
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