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【简答题】
写出下列反应方程式： (1)固体碳酸钠同氧化铝一起熔烧，将熔块打碎后投入水中，产生白色乳状沉淀。 (2)氢化铝锂与三氟化硼在醚溶剂中反应制备乙硼烷。 (3)铝和热浓的NaOH溶液作用，放出气体。 (4)三氟化硼通人碳酸钠溶液中。 (5)[GaH4]-与过量HCI反应的产物。
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反馈参考答案：
举一反三
【单选题】I received a letter， poor spelling made me think it was written by a child．
A.
which
B.
that
C.
whose
D.
who
【判断题】Test takers are penalized for writing more than the stated number of words, poor spelling and grammar.
A.
正确
B.
错误
【单选题】The typist checked the spelling carefully in order to ______ all the spelling mistakes.
A.
abandon
B.
diminish
C.
eliminate
D.
withdraw
【单选题】A résumé with poor grammar or spelling errors implies that the applicant ________.
A.
will not be a qualified employee
B.
is a reliable person
C.
is not interested in the job
D.
does not have higher degrees
【单选题】I failed to pass the English exam for my poor spelling. Oh,__________.If you agree,I’d like to help you with your spelling.
A.
nothing
B.
I am sorry to hear that
C.
I’m afraid so
D.
your spelling is so poor
【单选题】Everything about your composition is perfect ______ the poor spelling.
A.
except
B.
except for
C.
apart from
【判断题】There might be good, average and poor spellers in a class. An old-fashioned spelling test is usually a good idea to tackle their spelling needs.
A.
正确
B.
错误
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