21.The thirteen stripes of the United States flag represent the original thirteen states of the Union, which they all were once colonies of Britain.
34.The carbon-are lamp, a very bright electric lamp used for spotlights, consists of two carbon electrodes with a high-current are passing between it.
请教:0105语法21题c是不是应该是the thirteen original states.d中的all用法对否,有没有顺序要求,which were all once... 34题语法结构分析不出,谓语是哪个?consists 还是pass? with...应该用with a high-current passing between them 吧
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