太阳所含氢是够燃烧100亿年，到氢燃烧末期后，太阳就会消失。
参考答案：错
心动不如行动，我们要将爱心化作切实的行动，做行动的巨人。[ ]
Which spoken emergency signal would you use to call a boat to come assist a man overboard?（）
A.Distress signal
B.Urgency signal
C.Safety signal
D.None of the above
