D

    How old is "old"? The answer has changed over the years. Two Hundred years ago, you were old at 35. At the beginning of the 20th century, the average life span(平均寿命) was 45. In 1950, 70-year-olds were really old. Today, a healthy 70-year-old is still thought young.

    So, how old is "old"? The answer is one you've heard many times, from all kinds of people. "You are as old (or young) as you feel. " Your age simply tells you how many years you have lived. Your body tells you how well you've lived.

    "Nobody grows old by living a number of years, "Wrote a writer. "People grow old when they don't have their ideals(理想)." People shouldn't have the wrong ideas about aging. Sometimes, older minds can be as bright as young minds. Alice Brophy once said, "It makes me unhappy when people say, 'You look young for your age.' What does that mean? You know you can die old at 30 and live young at 80."

开学已经一个多月了，同学们对崭新的中学生活有些什么感想呢？下面就让我们一起来倾听和思考。

君君：在中学阶段，我必须“两耳不闻窗外事，一心只读圣贤书”。只要在中学阶段苦尽甘来，以后就不用学习了。

松松：课程又多又难，作业没完没了，学习真是一件苦差事！我们为什么要学习呢？我讨厌学习！

倩倩：从小学到现在，我一直都很努力学习，但成绩却不好。很多人因此说我不会学习。我该怎么办？请大家帮帮我。

人体生命活动所需要的能量不全是由糖类提供的．（判断对错）