Because the birds coast on the vortices created by the ultra-light craft, the tr

游客2023-12-11  29

问题 Because the birds coast on the vortices created by the ultra-light craft, the trip can only work in calm air at the sunrise.

选项

答案 the(sunrise)一/

解析 at sunrise是固定搭配,表示“日出时”,不用定冠词。类似的表示时间的名词还有sunset,noon,night,daybreak,dusk,dawn,midnight。
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