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【单选题】
6 13 表示的是蛋白质二级结构中何种类型?()A.
β-转角
B.
β-折叠
C.
α-螺旋
D.
自由回转
E.
其余选项都不是
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反馈参考答案：
举一反三
【单选题】People from every corner of the world___China on the successful launch of Shenzhou VII.
A.
celebrated
B.
appreciated
C.
greeted
D.
congratulated
【单选题】Christmas used to be a western festival, but now it _____ by people all around the world. A. is celebrating B. is to celebrate C. is celebrated D. has been celebrated
A.
is celebrating
B.
is to celebrate
C.
is celebrated
D.
has been celebrated
【单选题】Which day is the Double Seventh celebrated by people? ( )
A.
the 7 th day of the 7 th solar month
B.
the 7 th day of the 7 th lunar month
C.
the 14 th day of the 2 nd solar month
D.
the 14 th day of the 2 nd lunar month
【单选题】使用无菌容器时,下列哪项是错误的
A.
打开无菌容器盖时，盖的内面须向上放置
B.
手不可触及容器及盖的内面
C.
用毕立即将容器盖严
D.
手持无菌弯盘，应托住底部
E.
取出的无菌物品未被污染，应立即放回无菌容器内
【单选题】—Mother’s Day is celebrated across the world on the Sunday in May. —That’s right. People show their love for their mothers by giving some presents.
A.
first
B.
second
C.
third
D.
last
【单选题】On which day is Christmas celebrated by people?
A.
December 24th.
B.
December 25th.
C.
December 26th.
D.
December 27th.
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