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【单选题】
Researchers counted how many volunteers got sick. They found that ________.A.
no one in either group got sick
B.
people in both groups got sick a lot
C.
the group that took vitamin C was healthier
D.
the two groups got about the same number of colds
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举一反三
【简答题】I was writing my _________ (sign) at the bottom of the page.
【单选题】I was writing my paper last Sunday, otherwise I _____ you in the football game.
A.
would like
B.
joined
C.
should join
D.
could have joined
【单选题】I was writing my report last Sunday, otherwise I ______ you to the zoo.
A.
would like
B.
took
C.
should take
D.
could have taken
【多选题】描述学生的属性有:学号、姓名、出生年月,描述学会的属性有:学会名、成立年份、办公地点、人数,描述学生与学会的联系的语义是:每个学生可参加若干学会,每个学会有若干学生。学生参加某学会有一个入会年份,且只能参加一次。哪些函数依赖是正确的:
A.
学号→ 学会名
B.
(学号，学会名) → 入会年份
C.
(学号，学会名) → 人数
D.
学会名 → 人数
【单选题】I was writing my at the bottom of the page.
A.
sign
B.
signal
C.
signature
D.
significant
【单选题】描述学生的属性有学号、姓名、出生年月、系名、班号、宿舍区。如果一个系的学生住在同一宿舍区,可以得到的函数依赖是:
A.
系名→ 宿舍区
B.
宿舍区 → 系名
C.
宿舍区 → 班号
D.
系名 → 班号
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