Waves of red light are about twice as long as _______ of blue light.A．thoseB．th
题型：不详难度：来源：
| Waves of red light are about twice as long as _______ of blue light. |
答案
| A |
解析
试题分析：考查指示代词。句意：红光的波长是蓝光波长的两倍长。在比较级中，指代比较对象时，单数用that，复数用those，这里的比较对象是waves，故选A。 |
举一反三
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