单选题
Parents have a legal
duty
to ensure that their children are provided with efficient education suitable to their age.
【正确答案】
C
【答案解析】[解析] obligation指法律上或道义上的义务或责任，例如：a legal obligation to serve in the armed forces“服兵役的法律义务”。 impulse“驱使，推动”：the impulse of curiosity“好奇心的驱使”。influence“影响”；sympathy“同情心”。