_______ of the students has two books.
A、All
B、Both
C、Each
D、Every
第1题:
将students中的列变量重新命名为: (1)id_number, name, gender, score, has_graduate (2)选出Bob的性别gender,并存入变量bob_gender (3)选出列has_graduate,并存入向量status (4)创建数据框part_df,其中包含前三个学生的所有信息 (5)创建数据框rest_df,包含其余学生的所有信息
第2题:
Each life jacket light that has a non-replaceable power source must be replaced ______.
A.every 6 months after initial installation
B.every 12 months after initial installation
C.every 24 months after initial installation
D.on or before the expiration date of the power source
第3题:
–Wow! You’ve got so many clothes.
--But _____ of them are in fashion now.
A. all B. both C. neither D. none
第4题:
A. Every 5 minutes
B. Every 90 seconds
C. Every 60 seconds
D. Every 30 seconds
第5题:
My brother and sister are ___________ doctors.
A、all
B、both
C、 each
D、any
第6题:
A.both
B.neither
C.each
D.every
第7题:
26.
A.both
B.some
C.each
D.most
第8题:
Theteacheraskedtheboymanyquestions,butheonlyanswered______ofthem.
A.some
B.lots
C.each
D.few
第9题:
A、None
B、Both
C、Either
D、Neither