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【多选题】
下列哪些元素是通过光谱分析法被发现的：A.
Cs
B.
Rb
C.
Cl
D.
Na
E.
Pb
F.
O
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反馈参考答案：
举一反三
【单选题】Where did this conversation probably take place?
A.
In a hotel.
B.
In a restaurant.
C.
In a cafeteri
【单选题】Where does this conversation most probably take place?
A.
In a school.
B.
In a restaurant.
C.
In a coffee house.
【单选题】Where does this conversation take place?
A.
In a store.
B.
In a factory.
C.
In a museum.
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