46. B
依据：In 1605 some Englishmen planned to kill their king, James I, because they thought he was a bad man.
47. C
依据：One of the men had a relative who was coming to the House of Lords to meet the King. He warned his relative to stay at home.
48. D
依据：总结第三段可知.
49. B
依据：let off 点燃/引爆
50. B（楼主未打出CD,只能选B）
依据：Sparks from the bonfires sometimes set fire to fences, trees or houses.