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阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。续写字数应为150左右。

It was Mother's Day and I was shopping at a local supermarket with my son who was five years old, Tennyson. As we were leaving after finishing our shopping, we realized that only minutes earlier an elderly woman had fallen over at the entrance and hit her head on the ground badly. Her husband was with her, but there was blood everywhere and the woman was embarrassed and clearly in shock. Fortunately, a lot of people stopped to help out.

While we were walking towards the scene, Tennyson became very worried about what had happened to the elderly couple. He said to me, “Mom, it's not much fun falling over in front of everyone.” Seeing that there was a flower stall(摊位)at the front of the supermarket, he added, “Why shouldn't we buy the lady a flower? It will make her feel better.” I was amazed that he'd come up with this sweet idea. So we went over and told the flower seller what we wanted. “Just take it,” she replied. “I can't take your money for such a wonderful deed.”

By now medical staff had arrived, and were looking after the injured woman. There we saw the old man was also in great horror, but he tried to comfort his wife and held her hands tightly to encourage her to be strong. We gave the flower to the woman's husband and I told him it was from my son. At that time, the old man started crying and said, “Thank you very much.” He then turned to me, “You have a wonderful son. Happy Mother's Day to you.”

The man bent down and gave his wife the flower, telling her who it was from. Regardless of being badly hurt, the old lady looked up at Tennyson with love in her eyes and gave him a little smile. And my son bent down his body to the injured lady and tenderly said, “Happy Mother's Day to you, too.”

Paragraph 1:

After a moment, the elderly lady was taken into an ambulance,

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Paragraph 2:

One year later,

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已知正实数x，y满足，则的最大值为______．

已知函数，是定义在上的函数，其中是奇函数，是偶函数，且，若对于任意，都有，则实数可能的值为（       ）

A．

B．0

C．

D．1

已知函数.
(1)若对任意的恒成立，求的取值范围；
(2)当时，证明：.

已知函数．
(1)当时，求曲线在点处的切线方程；
(2)若是增函数，求a的取值范围；
(3)证明：有最小值，且最小值小于．

在椭圆中，其所有外切矩形的顶点在一个定圆上，称此圆为该椭圆的蒙日圆.该圆由法国数学家Monge（1746-1818）最先发现.若椭圆，则下列说法正确的有（       ）

A．椭圆外切矩形面积的最小值为48

B．椭圆外切矩形面积的最大值为48

C．点为蒙日圆上任意一点，点，，当取最大值时，

D．若椭圆的左､右焦点分别为，，过椭圆上一点和原点作直线与蒙日圆相交于点，，则

设动点M与定点的距离和M到定直线l：的距离的比是．
(1)求动点M的轨迹方程，并说明轨迹的形状；
(2)当时，记动点M的轨迹为，动直线m与抛物线：相切，且与曲线交于点A，B．求面积的最大值．

已知A，M，N是棱长为1的正方体表面上不同的三点，则的取值范围是________．

已知函数（，）
(1)讨论函数的单调性；
(2)若关于x的不等式恒成立，求实数m的取值范围．

Is there a way to turn back the aging process in people? For centuries, people have been looking for a “fountain of youth.” The idea is that if you find a magical fountain, and drink its water, you will not age.

Researchers in New York did not find an actual fountain of youth, but they may have found a way to turn back the aging process. It appears that the answer may be called the hypothalamus, which is part of your brain. It controls important body activities, including growth, the way we process food and so on. Researchers found that hypothalamus neural stem cells (干细胞) also influence how fast aging takes place.

Dongsheng Cai was the leading researcher in a study on aging in mice. He and his team reported their findings. “when the hypothalamus starts aging, particularly the loss of hypothalamus stem cells, so does the body.” he said.

Using this information, the researchers began trying to activate (激活) the hypothalamus in laboratory mice. The results show that the treatment slowed aging in the animals. “When we injected the hypothalamus stem cells to the middle-aged mice, the mice aged slowly and they could also live longer.”

But these results were just from studying mice in a laboratory. If the mice can live longer, does that mean people could have longer lives? The next step is to see if the anti-aging effects also work in human beings. If so, they say the findings could lead to new ways to help doctors identify and treat age-related health problems.

1．Why does the author mention the “fountain of youth” in the first paragraph?

A．To explain what the “fountain of youth” is.

B．To introduce the hypothalamus.

C．To show how to find the “fountain of youth”.

D．To help people find the “fountain of youth”.

2．What does the underlined word “it” in Paragraph 2 refer to?

A．The brain.	B．The aging process.
C．Hypothalamus.	D．The stem cell

3．What do we know about the study done by Cai?

A．They have found a way to turn back the aging process.

B．The brain controls growth, reproduction and the way we process food.

C．The decrease of hypothalamus stem cells can lead to aging.

D．The finding has been applied to human beings.

4．Which of the following can be the best title of the passage?

A．The Secret of Youth

B．A New Discovery about Aging

C．The Ways of Slowing Down Aging

D．Hypothalamus — the Fountain of Youth