According to the passage, before the Ice Age the continental shelf was submerged in water.
A. Right
B. Wrong
C. Not mentioned
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As there is always the Earth's gravitational(地心引力的)pull, people ______.
A. accept it without questioning it
B. never notice its presence
C. hardly think about how to use it
D. often try to escape from it
How long did the trip last？
A. 6 weeks.
B. 2 months or more.
C. Half a year.
D. 102 days.
A．placeB．foodC．referenceD．information
A. place
B. food
C. reference
D. information
According to the passage, the glaciers moved from the north directly the the south.
A. Right
B. Wrong
C. Not mentioned
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