Kites invented in China 2000 years ago. The 76. ______ earlier kites were made of wood, that were expensive. 77. ______ Ki

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问题     Kites invented in China 2000 years ago. The    76. ______
earlier kites were made of wood, that were expensive.    77. ______
Kite flying began to spread between ordinary people only    78. ______
after paper was invented and then kite making costs less.    79. ______
Weifang City is the birthplace of the kites. Now kite    80. ______
flying is more and more popular here. Every spring    81. ______
people all over the world come to take part in the    82. ______
International Kite Festival. We will see beautiful    83. ______
kites fly in the sky. I believe you will enjoy yourselves    84. ______
here. I hope you will go to the Festival every year.    85. ______

选项

答案costs—cost

解析 考查时态。本题主句用的是一般过去时态,从句描述的也是过去发生的事情,故从句也应用过去时态。cost的过去式同原形。
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