As we all know, the largest organ of your body is the . [ ]A. ski

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As we all  know, the largest organ of your body is the          .  [     ]
A. skin
B. face
C. head
D. leg

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举一反三

The Sahara Desert is a natural        between  north and central Africa.[      ]
A. fence
B. barrier
C. difficulty
D. border

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Poor health may be a            to success.    [     ]
A. difference
B. difficulty
C. fence
D. barrier

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He was killed after eating the beautiful mushrooms because they contained a deadly .[ ]
A. poison
B. protein
C. waste
D. food

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The hotel offers its guests a  wide          of amusements.[      ]
A. variety
B. attraction
C. interest
D. excitement

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Society is made up of a           of people; some are good, others bad, and still others in between.   [     ]
A. variety
B. choice
C. lot
D. plenty

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