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【单选题】
关系代数中的π运算符对应SELECT语句中的()字句。A.
SELECT
B.
FROM
C.
WHERE
D.
GROUP BY
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反馈参考答案：
举一反三
【单选题】We learn from the text that twenty years ago, Christine______.
A.
started her hobby by collecting magazines
B.
had a lot of girlfriends visiting her
C.
was worried about her marriage
D.
was in an unhappy marriage
【简答题】How to identify large numbers in listening pratice?
【单选题】The teacher told me to pay more attention_______ my pronunciation, so I made a_______ to pratice it every day.
A.
to, decision
B.
to, idea
C.
at, plan
D.
for, feeling
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