Height is just one of the thousands of features your genes（基因）decide．In fact，because you have two parents，your genes provide you a height that usually lands somewhere between the height of each parent．If both your parents are tall，then most probably you will be tall，too．But if you have questions about how tall you're going to be，ask your doctor if he or she can help you find it out．

But genes don't decide everything．For example，eating an unhealthy diet can keep you from growing to the expected height．But getting enough sleep and exercise will meet your need．

It s certain that you're wondering how fast you should grow．It depends．There's no perfect or right answer．Generally speaking，kids grow about 2 inches（6 cm）a year between age 3 and the time when they start adolescence．

Don't be scared if you seem to have grown a lot in a very short time．Everyone has a time to grow fastest during adolescence．The age for starting adolescence is about lo for girls and about 11 for boys．But it can be earlier or later--between 7 and 13 for girls and 9 and 15 for boys．

You'll usually begin to notice that you're growing faster about a year or so after your body starts to show the first changes of adolescence．

1．What does the underlined word “adolescence” mean in Chinese?

A．婴幼儿时期         B．童年时期             C．青春期                D．学生时期

2．If you want to know how fast and how tall you should grow，________．

A．you should eat a healthy diet                     B．you should have enough sleep

C．you can seek medical help from a doctor      D．you should have enough exercise

3．This passage is mainly about ________．

A．how the genes work in your body             B．how you grow to a certain height

C．when is the time you grow fast                   D．why you look like your parents

4．After reading this passage，we can explain ________．

A．what healthy diet is                                  B．how good it is to be a doctor

C．how much sleep time we need                     D．why genes can't decide everything

5．Which of the following sentences is NOT right according to the passage?

A．You．may be anxious sometimes when you grow too fast．

B．Boys' age for starting adolescence is usually later than that for girls'．

C．The time showing the first changes of adolescence is seldom noticed．

D．Your height most likely has something to do with how high your parents are．

用方框中所给词的适当形式填空，使短文完整正确。

old,  shoe,  stand,  foot,  pick,  small,  feel,  clear,  need,  use

Learn to share(分享)

One day, while I was sitting in my car in a parking area, I noticed a young boy in front of my car. "What is the boy doing?" I asked myself and looked closely. "Oh, he is 1. ________ up a coin from the ground. " When he 2. _______ up, we saw each other 3. ______ , He was not 4.___  than ten and was wearing one blue glove(手套) and One brown glove. His coat was too 5.  ___ for him.

As he walked away, I saw his 6. ________, which were too old to wear, I rolled down my window and called him over.

1 asked him if he7. _____ some money.  He replied, "No. That's okay. "

The parking area was wet, 1 could tell that his 8. ______ were cold because he kept moving his weight from one foot lo the other,

"Please," 1 held Out a five-dollar bill(钞票). "It's not much, but when the money is shared, it is much more 9._______ . " I said.

He look off one of his gloves and took the money from my hand. His small hand was red and cold.

He smiled and went away after saying "Thank you!" to me. That smile made me 10. _____  warm in the cold winter.