In this passage, we've learned about________

1You usually learn the knowledge discussed in this passage in_________classes.
A.chemistry
B.math
C.history
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2Which of the following statements is TRUE according to the passage、
A.Most earthquakes are very dangerous, so we must be very careful every day.
B.You'd better keep away from those things that may fall on you wherever you are.
C.If you smell gas at home, try to hide under a desk and don't run outside quickly.
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3The best title of this passage is "_________".
A.How dangerous the earthquake is
B.How to be safe during an earthquake
C.Don't be afraid of the earthquake
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4If you're in a shop and far from the door, you'd better_________.
A.rush to the door fight away
B.run after the people quickly
C.hide yourself under a cover near you
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5If you are outdoors,it would be safe to _______
A.go to a playground
B.stay under a tree
C.stand by the window
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In this passage, we've learned about_________kinds of shapes.