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【单选题】
幼儿的餐具用要及时洗净,每日煮沸一次,一般___分钟,然后取出,注意保洁。A.
1 〜5
B.
5〜10
C.
10〜15
D.
15〜20
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举一反三
【简答题】常见的网络服务有()()()()()
【单选题】Recognized as ________ world cultural heritage by the United Nations in 2002, paper cutting is ________ practice which originated in ancient China.
A.
the; a
B.
a; a
C.
the; the
D.
a; the
【单选题】Dr. Swanson has written articles about interstellar travel.
A.
underwater
B.
long-distance
C.
high-speed
D.
outer space
【单选题】What does the author think interstellar travel can do?
A.
It practically enables human to escape the end of the world.
B.
It simply postpones the process of human extinction.
C.
It helps human avoid the fate of being vaporized or frozen.
D.
It is a way to help human escape from death by gravity.
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