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【单选题】
She worked hard and was soon promoted to __________ chief editor.A.
/
B.
a
C.
an
D.
the
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反馈参考答案：
举一反三
【单选题】Prior to boarding from a vessel, a davit-launched life raft should be well ventilated of excess ______.
A.
hydrocarbon gas
B.
carbon monoxide gas
C.
carbon dioxide gas
D.
freon gas
【简答题】①x+456=546 ②876-x=198．
参考解析：
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