皮皮学，免费搜题
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【单选题】
“是故学然后知不足,教然后知困。知不足,然后能自反也,知困,然后能自强也。故曰:教学相长也。”这句话出自?A.
B.
论语
C.
D.
大学
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皮皮学刷刷变学霸
举一反三
【单选题】We’d love to help visitors travel around this ________ underwater world.
A.
wonderful
B.
worldwide
C.
worthwhile
D.
windy
【单选题】The underwater world is perhaps the most popular place _________ people, esp. youngsters prefer to visit.
A.
that
B.
where
C.
in which
D.
what
【单选题】Why did the U.S. Navy set up underwater microphones around the world in the 1960s?
A.
To listen for changes in ocean structure.
B.
To listen for changes of ocean currents or volcanic activity.
C.
To make sure whether there was a giant squid deep in the ocean.
D.
To follow the track of the Soviet warships under water.
【简答题】The underwater part of an iceberg is ______.
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