皮皮学，免费搜题
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搜题
【单选题】
刚玉是自然界中硬度仅次于金刚石的物质，它由地壳中含量最多的金属元素、非金属元素所组成．刚玉的化学式为（ ）A.
SiO 2
B.
Fe 2 O 3
C.
Al 2 O 3
D.
Fe 3 O 4
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】Listening exercise 1
A.
a good way to learn a foreign language
B.
a chance to travel the world
C.
a chance to widen her horizons and deepen her knowledge
D.
to make friends with foreigners
E.
to have close contact with other cultures
F.
to develop social skills and diversify her life
【简答题】Listening Exercise 1
【多选题】Listening exercise 1---Dialogue 1
A.
David played football with a mask on his face.
B.
David was not happy about his football match.
C.
The football match was great.
D.
The football match was cancelled.
【多选题】Listening exercise 1 (Dialogue 1)
A.
How may I help you?
B.
What can I do for you?
C.
Hold the line, please.
D.
Can you hold for a moment?
E.
Would you like to leave a message?
F.
Anything I can do for you?
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