A、 Two US passenger planes have crashed.
B、 The accident occurred in an unknown island.
C、 There were six people in two helicopters.
D、 The accident occurred on Thursday night.

【正确答案】 D

【答案解析】解析：新闻开头说到两架美国海军陆战队直升机相撞，此事故发生在周四晚上。故D正确。发生事故的飞机是两架美国海军直升机，而不是客机(passenger planes)，故A错误。事故发生在夏威夷的欧胡岛，故B也不对。两架飞机各有6人，共12人，故C错误。

A、 It was dark and there was a high surf advisory.
B、 Two Marines were killed during training.
C、 The reason of the accident is unclear.
D、 A night-time training mission is dangerous.

【正确答案】 A

【答案解析】解析：新闻提到Mooers女士告诉洛杉矶电台KNX-AM，因为黑暗和一个巨浪警告(darkness and a high surf advisory)，所以这次搜救会很艰难。A正确。B“两名海军陆战队员在训练时被杀”是新闻末尾提到的另一场事故。C“事故的原因未知”在新闻开头有提到，但这都不是搜救困难的原因。D“夜间训练很危险”没有在新闻中提到。