John put the last of paint in his model spaceship. He’d 76. ______ painted it silver and blue. He held it up to show dad. "It

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问题     John put the last of paint in his model spaceship. He’d    76. ______
painted it silver and blue. He held it up to show dad. "It    77. ______
looks greatly," said dad. "Let me help you hang it." They    78. ______
hanged the model from the ceiling with thin thread. John    79. ______
watched the spaceship swing back or forth. He began to think    80. ______
about journeying all lonely out of space. "Suppose a man is in    81. ______
the spaceship," John said. "And could he run out of water to drink?"    82. ______
"Yes," said dad. "And could he run out of air to breath?" "Of course,"    83. ______
answered dad. "Then which would happen to him?" John asked. "I don’t    84. ______
think he’d live long. Do you think that?" asked dad. "No, I don’t    85. ______
think I’d like to be out in a spaceship," said John.

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答案or—and

解析 考查连词用法和固定搭配。or和and表示的虽然都是并列的逻辑关系,但or指“二者择一”,而and则指“二者兼有”。本题指飞船模型挂起来后前后摆动,显然是前后方向“二者兼有”,故应用and而不能用or。事实上back and forth是个固定搭配,指“来回地,来来往往地”。
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