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【单选题】
Be 3+ 的一个电子所处的轨道,能量等于氢原子 1s 轨道能,该电子所处的轨道可能是 ( )A.
(A) 1s
B.
(B) 2s
C.
(C) 3p
D.
(D) 4d
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反馈参考答案：
举一反三
【单选题】Tom was made_______ his own clothes by his mother．
A.
wash
B.
washed
C.
to wash
D.
washing
【简答题】请同学们准确写出本门课程的名称《 》。
【单选题】Tom often makes his little sister , but yesterday he was made by his sister.
A.
cry ; to cry
B.
to cry ; cry
C.
cry ; cry
D.
to cry ; to cry
【单选题】—Do you know ______ Tom was punished by his father? —That was ______ he refused to go to school.
A.
why; because
B.
when; why
C.
how; when
D.
why; why
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