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【单选题】
已知关系R如下表所示。仅就此表而言， R的候选键为_________。【图片】A.
(A2，A3)
B.
(A1，A2)
C.
(A1，A2，A4)
D.
(A1，A3，A5)
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反馈参考答案：
举一反三
【单选题】An investigation group _________ five men and two women has been sent to the spot to look into the matter. [ ]
A.
consists of
B.
is consisted of
C.
consisting of
D.
consisted of
【简答题】请根据以下内容回答下列各题 A professional group is now considering changing the diagnosis of autism-spectrum disorders partly by adding consideration of________。
【单选题】Five men and three women make up the temporary group to look into the case. In other words，it _____ eight people. [ ]
A.
consists of
B.
is consisted of
C.
is consisting of
D.
is being consisted of
【单选题】Only one group of five letters below can be arranged to form. a five-letter English word. Which group is right?
A.
TACPU.
B.
LEABO.
C.
TCINA.
D.
LIUDT.
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