下图N为北极点，GD为晨线，DN=1/4AN，且弧GEF逐渐缩小。读图，回答下列问题
题型：填空题 案例分析题
问题：
下图N为北极点，GD为晨线，DN=1/4AN，且弧GEF逐渐缩小。读图，回答下列问题。
架飞机从G点飞到F点，最合理的飞行路线是（填写字母）（），其方向是（）。
题型：填空题 案例分析题
根据语篇情景，用恰当的短语或句子填空，使之意思完整。
If you often feel tired, and the doctor can’t find anything wrong with you, you may be in a state of sub-health（亚健康）. Sub-health is a state between health and illness. Most of the sub-healthy people are middle-aged ones who 1.____________ because of work and family. And some of them are students who are having exams.
If you are sub-healthy, it’s not difficult for you to recover（恢复）. You should 2.____________. For example, you should get up early and go to bed early. And you should exercise regularly. Exercising can keep you healthy. As for meals, it’s better to eat less salt and sugar. Vegetables, fruit and fish are important to your body. You should eat more of them. It’s not good to eat too much at one meal, because it is bad for your digestive tract（消化道）. In a word, 3.____________ is very helpful in avoiding（避免）sub-health.