单选题 Children and teenagers sometimes do dangerous and foolish things，and that is_______ hey do not understand or think about the consequences.

【正确答案】 C

【答案解析】考查表语从句。“that is because…”引出原因；“that is why…”引出结果；“that is how…”引出方式。句意：小孩子和青少年有时会做一些危险而愚蠢的事情，那是因为他们不明白或没有考虑到事情的后果。