Some caves are open for visitors.  Guides take people downstairs to go into the (51) c         . Then they (52) g        people on paths under the ground.  The paths are lighted. As the people walk through,the guides tell (53) h        the caves were formed.

Some people would rather see a wild cave. Wild caves (54) d        have stairs or lights. People who know how to go into wild caves are (55) c        cavers. They take classes to learn how to go (56) t        the caves safely.   Wild caves can be very

d (57)         . Some parts may be underwater. Other parts may have very low roofs.

At Carlsbad Caverns people can go into a cave that is almost (58) w         . It is called

a new cave. There are stairs at the start. (59) B        there are no bright lights or paved paths. People take their own flashlights,they (60) f        a guide along paths marked with red tape.

 51. caves   52. guide   53. how   54. don't 55. called   56. through   57. dangerous   58. wild   59. But   60. follow

題目來(lái)源:長(zhǎng)江作業(yè)本同步練習(xí)冊(cè)九年級(jí)英語(yǔ)下冊(cè)人教版 > Unit 14 Have you packed yet?

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