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【简答题】
关于节气常识，下列说法不正确的是( ) A.夏至，太阳直射北回归线，北半球太阳高度角最大 B.冬至，北半球一年中影子最短，白昼时间最短 C.春分、秋分昼夜等长。白露是北半球昼夜温差最大的时间 D.从立春开始，立春在每年的2月4日左右，每个月两个节气
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举一反三
【单选题】听力原文：W: Hello, John, how are you feeling now? I hear you've been ill. M: They must have confused me with my twin brother Rod. He's been sick a week, but I've never found better in my life. What do we ...
A.
He is taking care of his twin brother.
B.
He has been in his perfect condition.
C.
He must be feeling ill in his health.
D.
He is worried about Rod's health.
【单选题】Many questions have been answered by John. He must have previewed the lessons last night, ____ he?
A.
needn’t
B.
hasn’t
C.
didn’t
D.
mustn’t
【简答题】John must have been busy yesterday,otherwise he ____________________(come) to the party.
【简答题】John must have been dissatisfied his achievement in computer science for he working further in the field.
【单选题】下 列 表 达 式 错 误 的是
A.
甲烷的电子式：
B.
氮原子的 L 层电子的轨道表示式：
C.
硫离子的核外电子排布式： 1s 2 2s 2 2p 6 3s 2 3p 4
D.
碳 •12 原子： 12 6C
【单选题】— Where is John? — He _____ in the library.
A.
should be
B.
must be
C.
can be
D.
must have been
【简答题】目前数码相机使用的成像芯片主要有 芯片和CMOS芯片两大类。
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