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【单选题】
做焰色反应实验用的铂丝，每试验一种样品后都必须
A.
用水洗涤 2 ～ 3 次后再使用
B.
用盐酸洗涤后，经蒸馏水冲洗，使用
C.
用滤纸擦干后使用
D.
用盐酸洗涤后，再在酒精灯火焰上灼烧到没有颜色，使用
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参考答案：
举一反三
【单选题】Robert Frost felt a little _______ for not choosing the other road. He doubted a little that once choosing the road, it would become his life road and may never come back.
A.
happy
B.
sad
C.
indifferent
D.
pitiful
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【简答题】Tony’s request The author’s feeling Results “I mow your lawn.” Well, what do you do with such determination and hope? ... he had graduated as a skilled grinder. ... My wife and I felt it was a sat...
查看完整题目与答案
【单选题】Once he realizes that it is his mistake, Jim never ________ to admit and correct it.
A.
hesitates
B.
doubted
C.
hesitated
查看完整题目与答案
【单选题】He doubted _____ it was true.
A.
that
B.
as if
C.
if
D.
as though
查看完整题目与答案
【简答题】影响招聘的外部因素主要有哪些?
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【单选题】There isn't _______ tea in your cup. Would you like ________? [     ]
A.
some; some
B.
some; any
C.
any; some
D.
any; any
查看完整题目与答案
【单选题】He doubted______ it was true.
A.
if
B.
that
C.
as though
D.
as if
查看完整题目与答案
【简答题】给下列单词分类。 cashier    clerk    fifty    duck    goat    gym    shop    elephant    library    sixty    tiger    waitress  wolf    restaurant    pig    kangaroo 职业: 数字: 场所: 动物:
查看完整题目与答案
【判断题】Goat and Tiger babies are not Chinese parents’ first choice.
A.
正确
B.
错误
查看完整题目与答案
【单选题】His friends and doctors very much ________ whether he could do it.
A.
doubted
B.
doubtful
C.
undoubtedly
查看完整题目与答案
相关题目：
【单选题】Robert Frost felt a little _______ for not choosing the other road. He doubted a little that once choosing the road, it would become his life road and may never come back.
A.
happy
B.
sad
C.
indifferent
D.
pitiful
查看完整题目与答案
【简答题】Tony’s request The author’s feeling Results “I mow your lawn.” Well, what do you do with such determination and hope? ... he had graduated as a skilled grinder. ... My wife and I felt it was a sat...
查看完整题目与答案
【单选题】Once he realizes that it is his mistake, Jim never ________ to admit and correct it.
A.
hesitates
B.
doubted
C.
hesitated
查看完整题目与答案
【单选题】He doubted _____ it was true.
A.
that
B.
as if
C.
if
D.
as though
查看完整题目与答案
【简答题】影响招聘的外部因素主要有哪些?
查看完整题目与答案
【单选题】There isn't _______ tea in your cup. Would you like ________? [     ]
A.
some; some
B.
some; any
C.
any; some
D.
any; any
查看完整题目与答案
【单选题】He doubted______ it was true.
A.
if
B.
that
C.
as though
D.
as if
查看完整题目与答案
【简答题】给下列单词分类。 cashier    clerk    fifty    duck    goat    gym    shop    elephant    library    sixty    tiger    waitress  wolf    restaurant    pig    kangaroo 职业: 数字: 场所: 动物:
查看完整题目与答案
【判断题】Goat and Tiger babies are not Chinese parents’ first choice.
A.
正确
B.
错误
查看完整题目与答案
【单选题】His friends and doctors very much ________ whether he could do it.
A.
doubted
B.
doubtful
C.
undoubtedly
查看完整题目与答案
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