Oranges were known in China about four thousand years ago.

    There are two kinds of orange trees, the sweet and the sour (酸的) . At first, people in Europe only had sour oranges. They started to grow them around the ninth century. From the eleventh century, sour oranges were widely grown in southern Europe.

    Until the fifteenth century, sweet oranges were brought to Europe by business from the East. They were a kind of rare fruit at that time. Only very rich people could pay for them. They paid a lot of money to get the orange trees. They planted these trees in their gardens.

    In the colder countries, these expensive orange trees would be killed during a cold winter, so the rich people built greenhouses for them. The orange trees were planted in tubs (盆). During the summer they were moved outside, but in winter, they were kept safe behind the glass in the greenhouses.

    When Christopher Columbus went to America by sea, he carried many oranges with him. Since then sweet oranges have grown very well in the New World in the warm weather.

     Today the United States produces the most oranges in the world.

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106. From the passage, we know that ___________ were first found in ___________.

107. Sour oranges became ___________ in Europe after the ___________ century.

108. Sweet oranges were so rare that ___________ rich people could get them in ___________ at that time.

109. Sweet oranges couldn’t be ___________ outside in the colder countries because they would be ___________ in winter

110. Sweet oranges ___________ very well in America because the ___________ was good for them.

________ the oranges are bad. This one's bad, and that one's bad, too.

1. A.
   All the
2. B.
   Both the
3. C.
   All of
4. D.
   Both of