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【单选题】
下列实验操作中错误的是（ ）A.
进行蒸发操作时，蒸发皿中出现大量固体时，即可停止加热
B.
进行蒸馏操作时，应使温度计水银球靠近蒸馏烧瓶的支
C.
进行分液操作时，分液漏斗中下层液体从下口放出，上层液体从上口倒出
D.
进行萃取操作时，应选择有机萃取剂，且萃取剂的密度必须比
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【单选题】--Could you tell me ? --Glad to help. [ ]
A.
if I have been to the Great Wall
B.
where did he study
C.
how I can get to the post office
D.
what's your name
【单选题】Could you tell me _ next? I really don't know. [ ]
A.
how to do
B.
what to do
C.
to do what
D.
to do how
【单选题】Could you tell me_________？
A.
where is the headmaster
B.
whose camera it is
C.
what Jack was happened
D.
how long does it take you to your school?
【单选题】-Could you tell me________you'll be away? -Only one week. [ ]
A.
how much
B.
how soon
C.
how often
D.
how long
【多选题】下列描述属于活动矫治器的优点的是
A.
避免损伤牙体组织
B.
能使多数牙移动，整体移动、控根移动等较容易
C.
体积小，舒适
D.
可自行取戴，不影响美观
E.
容易保持矫治器清洁和口腔卫生
【单选题】—Excuse me, could you tell me _____? —Sorry, I'm new here, too. [ ]
A.
where is the nearest bank
B.
how can I get to the bank
C.
which is the way to the bank
D.
is there a bank near here
【单选题】— Excuse me, could you tell me _____? — Sony, I'm new here. [ ]
A.
where is the railway station
B.
how can I get to the railway station
C.
where the railway station was
D.
which bus I shall take to the railway station
【单选题】---Could you tell me _________? ---You can take the No. 1 bus.
A.
how can we get to Xingyi Airport
B.
how we can get to Xingyi Airport
C.
how do we get to Xingyi Airport
D.
how we got to Xingyi Airport
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