有甲、乙两块麦田，平均亩产420千克．甲块麦田有5亩，平均亩产450千克，如果乙

一个数的整数部分是24个十，小数部分是由15个百分之一组成的，这个数是[ ]

A．24.15

B．240.015

C．2.4015

D．240.15

阅读理解。

     "If you want to see a thing well,reach out and touch it!"

     That may seem a strange thing to say it.But touching things can help you to see them better.

     Your eyes can tell you that a glass ball is round.But by holding it in your hands,you can feel

how smooth and cool the ball is.You can feel how heavy the glass is.When you feel all these

about the ball,you really see it.With your skin,you can feel better.For example,your fingers

can tell the difference between two coins in your pocket.You can feel a little drop of water

on the back of your hand,too.You can even feel sounds against your skin.Have you ever

wanted to know why some people like very loud music?They must like to feel the sounds

of music.

     All children soon learn what "Don't touch!"means.They hear it often.Yet most of us keep

on touching things as we grow up.In shops,we touch things we might buy:food,clothes.To see

something well,we have to touch it.The bottoms of our feet can feel things,too.You know

this when you walk on warm sand,cool grass or a hard floor.All feel different under your feet.

     There are ways of learning to see well by feeling.One way is to close your eyes and try to

feel everything that is touching your skin.Feel the shoes on your feet,the clothes on your body,

the air on your skin.At first,it is not easy to feel these things.You are too used to feel them!

     Most museums are just for looking.But today some museums have some things to touch.

Their signs say,"Do touch!"There you can feel everything on show.

     If you want to see better,reach out and touch.Then you will really see!

1．By touching things________.

A．you will have a strange feeling

B．you will learn how to reach out your hand

C．you can learn more about them

D．you can tell what colors they really are

2．Which of the following can be the best title of the story?_____

A．Touching by Feeling

B．To See or to Feel

C．To See Better-Feel

D．Ways of Feeling

3．Which of the following parts can tell you the difference between two coins in

your pocket?______

A．your fingers

B．your eyes

C．your skin

D．your back

4．What can't your skin feel?_____

A．Sounds.

B．Darkness.

C．Water.

D．Coins.

5．Which of the following is NOT true?_____

A．Touching is helping us to see better.

B．Our skins may help us enjoy music.

C．People don't have to learn to feel.

D．Visitors can't feel the things on show in any museums

（）主要用于制作承受交变载荷、很大的接触应力，并在冲击和严重磨损条件下工作的零件，如汽车、重型机床齿轮、活塞销、内燃机的凸轮轴等。

A.渗碳钢

B.调质钢

C.弹簧钢

D.滚动轴承钢

支配上颌第二磨牙牙髓及颊侧牙龈、黏膜、骨膜的为（）

A.腭前神经

B.上牙槽前神经

C.上牙槽中神经

D.上牙槽后神经

E.鼻腭神经

尿血与血淋的区别在于有无：（）

A.尿频

B.尿急

C.尿痛

D.脓尿

E.排尿不畅