我在做语法题时遇到乐以下几个问题,请各位帮助我解答: 一下：

　　 1. The history of painting is a fascinating chain: of events that probably began with ---

　　 A. the very first ever made pictures

　　 B. the very first pictures ever made

　　answer: B

　　 2.Jupiter, the closets of the giant planets to: Earth, has----solid surface and is surrounded by Zones: of intense radiation.

　　 A. no

　　 B. not

　　 C. nor

　　 D. neither

　　answer: A

　　 3. It has been reported that _during_ any twenty_four

　　A: _hour_ period, _a minimal of_ three hundredNorth Aemrican

　　 B 

　　C: women _start_ their own businesess.

　　 D

　　 答案是C，我也知道C肯定错，但是B的hour为什么不用复数呢？

　　 请大家帮助解答一下哦，多谢乐！

　　answer: hour在这个句子里与 twenty four 共同构成 period 的定语.

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