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【单选题】
Team sports help to develop a child's skills.A.
natural
B.
listening
C.
social
D.
working
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反馈参考答案：
举一反三
【简答题】____ Iris has a great smile. ____ Iris asks you questions about yourself. ____ Iris is a pleasure to be around. ____ Iris really listens when you talk.
【简答题】inflammation of the iris __________
【单选题】. Not only I but also David and Iris ______ fond of playing basketball.
A.
am
B.
is
C.
are
D.
Was
【多选题】为了查看iris的各变量的数据类型,可以使用如下哪些方式?
A.
apply(iris,2,class)
B.
sapply(iris,class)
C.
lapply(iris,class)
D.
for(i in 1:ncol(iris)) class(iris[,i])
E.
vapply(iris,class,character(1))
【单选题】Mrs Stevens was most ______about your work
A.
compliment
B.
complimentary
C.
complement
D.
complementary
【简答题】iris cross ______。
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