单项选择题
Questions 11 to 18 are based on the conversation you have just heard
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A.She’s locked out of her room.
B.She lost her key in the shop.
C.She left her key in the room.
D.She won’t go shopping without a security guard.
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单项选择题
Producing a thermogram is ______.
A.expensive because of the high voltage the machine requires
B.a time-consuming process
C.inexpensive after the machine is purchased
D.an unsafe procedure
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