根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

__1__ From 18-25, according to I.Q. scores;  but you are wiser and more experienced with increasing age.

You are smartest in your 20`s; around 30, your memory begins to go down, particularly your ability to perform mathematical computations, __2__ Your vocabulary at the age of 45, for example , is three times as great as then you graduated form college. At 60, your brain possesses almost four times as much information as it did at the age of21.

__3__ You have the best physical sense of yourself from 15 to 24; the best professional sense form 40 to 49.

Before the age of 24, we believe that our happiest years are yet to come; over 3 0, we believe that they are behind us. A National Health survey agrees: after the age of 30, we “ become more realistic and do not view happiness as a goal in itself. If we maintain our health, achieve professional and emotional goals, happiness, we feel, will follow”.

__4__ Generally between 30 and 39, but the peak(顶峰) varies with different professions.

Mosart wrote a symphony(交响曲) and four sonatas by the age of 8, and Mendelssohn composed（作曲） his best known work A Midsummer Night` s Dream, at 17, but most of the great music was written by men between 33 and 39.

Though the peak in most fields comes early, most Nobel Prize winners did their top research in their late 20`s and 30`---creative people continue to produce work with high quality throughout their lives.__5__.

A．When are you most creative (创造性的)？

B．When are you happiest?

C．When are you smartest?

D．Do you know what I.Q. refers to?

E. But your I.Q. for other tasks goes up.

F. Creative people usually produce a lot of works.

G. For the “well-conditioned mind”, there is no upper limit.

One afternoon，my son Adam asked me, "Are all people the same even if they are different in color?"
I thought for a minute, and then I said, "I'll explain，26 you can just wait until we make a quick  27  at the grocery store. I have something  28  to show you.”
At the grocery store, we  29  some apples --- red, green and yellow ones. Back home, I told Adam, "It's time to  30  your question. " I put one apple of each  31  on the table. Then I looked at Adam, who had a  32  look on his face.
"People are like apples. They come in all  33  colors, shapes and sizes. On the  34  , some of the apples may not  35  look as delicious as the others." As I was talking, Adam was  36  each one carefully.
Then, I took each of the apples and peeled （削皮) them,  37  them back on the table, but  38 different place.
"Okay, Adam, tell me which is which. "
He said, "I   39   tell. They all look the same now. " "Take a bite of   40  . See if that helps you  41  which one is which.”
He took  42  , and then a huge smile came across his face. "People are  43  like apples! They are all different, but once you  44   the outside,  they're pretty much the same on the inside. "
He totally  45  it. I didn't' need to say or do anything else.

One afternoon，my son Adam asked me, "Are all people the same even if they are different in color?"

I thought for a minute, and then I said, "I'll explain，26 you can just wait until we make a quick  27  at the grocery store. I have something  28  to show you.”

At the grocery store, we  29  some apples --- red, green and yellow ones. Back home, I told Adam, "It's time to  30  your question. " I put one apple of each  31  on the table. Then I looked at Adam, who had a  32  look on his face.

"People are like apples. They come in all  33  colors, shapes and sizes. On the  34  , some of the apples may not  35  look as delicious as the others." As I was talking, Adam was  36  each one carefully.

Then, I took each of the apples and peeled （削皮) them,  37  them back on the table, but  38 different place.

"Okay, Adam, tell me which is which. "

He said, "I   39   tell. They all look the same now. " "Take a bite of   40  . See if that helps you  41  which one is which.”

He took  42  , and then a huge smile came across his face. "People are  43  like apples! They are all different, but once you  44   the outside,  they're pretty much the same on the inside. "

He totally  45  it. I didn't' need to say or do anything else.

2.A. stop         B. start           C. turn         D stay

3.A. expressive    B. encouraging     C informative   D. interesting

6.A. size          B. type            C: shape       D. class

11.A. examining    B. measuring       C: drawing     D. packing

14.A. mustn't       B. can't           C shouldn't     D. needn't

17.A. big bites     B. deep breaths     C a firm hold   D. a close look

19.A. put away     B. get down       C hand out      D. take off    

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
__1__ From 18-25, according to I.Q. scores;  but you are wiser and more experienced with increasing age.
You are smartest in your 20`s; around 30, your memory begins to go down, particularly your ability to perform mathematical computations, __2__ Your vocabulary at the age of 45, for example , is three times as great as then you graduated form college. At 60, your brain possesses almost four times as much information as it did at the age of21.
__3__ You have the best physical sense of yourself from 15 to 24; the best professional sense form 40 to 49.
Before the age of 24, we believe that our happiest years are yet to come; over 3 0, we believe that they are behind us. A National Health survey agrees: after the age of 30, we “ become more realistic and do not view happiness as a goal in itself. If we maintain our health, achieve professional and emotional goals, happiness, we feel, will follow”.
__4__ Generally between 30 and 39, but the peak(顶峰) varies with different professions.
Mosart wrote a symphony(交响曲) and four sonatas by the age of 8, and Mendelssohn composed（作曲） his best known work A Midsummer Night` s Dream, at 17, but most of the great music was written by men between 33 and 39.
Though the peak in most fields comes early, most Nobel Prize winners did their top research in their late 20`s and 30`---creative people continue to produce work with high quality throughout their lives.__5__.

Gray hair is simply a part of the normal aging process, and the rate you go silver is genetically predetermined. Going gray is not associated with earlier death, and premature graying is not, generally speaking, a sign of an illness or ill health in younger adults. There are, however, some specific health conditions associated with gray or white hair, but for most of us, going gray is just a fact of life.

Hair color comes from the pigment melanin(黑色素), which determines your individual shade. Hair without any melanin is pure white. The pigment is produced in cells called melanocytes, which inject pigment into the hair. At some point in everyone's lifetime, these cells slow down and eventually stop producing color. Scientists have yet to identify the exact mechanism by which melanocyte cell death occurs.

A study of more than 4,000 women and men from 20 countries determined that about 75% of people between the ages of 45 and 65 have some gray hair. In general, people of European descent gray earliest followed by Asians and Africans. It's interesting to note that a lucky 1 in 10 has no gray hair by retirement age. Beginning at age 30, your chances of having gray hair go up 10-20% per decade.

It may feel like you have more grays after a stressful event, but that's probably because middle age is basically a series of anxiety-ridden events. Between working, raising kids, and caring for older parents, the "sandwich" years of 45-65 can be stressful, especially for women. They are also when we naturally start to look older.

At this point, there is still no silver bullet to keep away the grays.

1.What would be the best title for this passage?

A. Going gray.                   B. Tips to make hair color last

C. Why does hair turn gray?        D. Gray hair is in fashion.

2.Which of the following is a true statement according to the passage?

A. Scientists have found out how to prevent hair from turning gray.

B. Europeans are more likely to gray than Asians and Africans.

C. Gray hair means poor health or a sign of illness.

D. Everyone will inevitably get gray hair by retirement age.

3.Which is not among the reasons for hair turning gray according to the passage?

A. Being physically weak.         B. Stress from different sides.

C. Death of melanocyte cell.       D. Genetic factors.

4.What does “silver bullet” in the last paragraph probably mean?

A. Make-up     B. Scientific research.     C. Chemical weapon.     D. Cure.