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【单选题】
下列叙述中错误的是A.
单质氧有两种同素异形体，即氧气和臭氧
B.
单质硫的分子以环状 S8 最为稳定
C.
氧、硫、硒、碲的价层中都存在空的 d 轨道，故可显 +2 、 +4 、 +6 氧化态
D.
自然界中既存在单质氧也存在单质硫
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反馈参考答案：
举一反三
【简答题】这首 a 小调前奏曲的演奏难点在哪里?
【单选题】What does the sentence 'For a politician looking to make the often-bloodless debate over health care come alive, this is a huge opportunity' (the last paragraph) suggest?
A.
Politicians can take advantage of misdiagnosis crisis to debate.
B.
The government should consider setting up a better medical system.
C.
Health care is a good topic for the politicians to debate about.
D.
Politicians should debate over how to create opportunities for people.
【单选题】This was a _____ to today's bloodless revolution.
A.
prologue
B.
dialogue
C.
monologue
D.
prolong
【判断题】The Glorious Revolution is also called “the Revolution of 1688” and “the Bloodless Revolution”.
A.
正确
B.
错误
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