阅读下面的短文，掌握其大意，然后从各题所给的选项中选出一个最佳选项。

Tick, tick, tick! Good morning, Jim! It’s 6:30 now. It’s time   1   up. Do you know me? I’m your new friend. My name is Clock. Look   2  me. I have no feet,  3  I can walk with my hands. I have no mouth, but I   4  speak to you. Now please listen to   5 . Today is Monday. You have many things to do. Classes  6 at 8:00. You have four classes in the morning and two classes in the afternoon. After 3:40 you have a basketball match   7  Class Two. You come   8  at 5:40. You have supper at 6:00. You   9  CCTV news at 7:00. And you go to bed at 9:30. Now please get up quickly and have your breakfast or（否则）you will be   10 .

These days，cars are designed using computers．Let’s look at how a new car is created．
First，several   16  talk about the new car and any good ideas that they have．Then they sit down at their computers and   17  many sketches．The best two or three drawings are chosen and then more detailed drawings of   18  are developed on the computer．You can change the size，shape or color of any part on the computer to see   19  the car would look and then you can choose the best design．
Both the inside and the outside of the car have to be designed．Part of the inside of the car is    20 so that the designers can sit in it．They can feel if there is enough  21 inside and if they can reach  22 ．Then some cars are built-there are more than 15，000 parts of a car to 23 ．
When everything is known to be   24  ，the cars are made in the factory．Again，computers are used to make sure that all the parts are   25  as they are needed．The factory
usually stays open all through the night so that the car production never stops．

　 We know that trees are useful in our everyday life. They   1  us many things, such as wood, oxygen, rubber, medicines and many other things. They can  2  tell us a lot about our climate. The following are the reasons. If you   3  a tree, you can see that it has many rings. Most trees grow one new ring   4  year. Because of the reason, we know   5  a tree is. A tree over a hundred years old means that it has more than a hundred   6 . When the climate is dry or very cold, the trees do not grow very much and their rings are usually   7 . When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the   8  changed suddenly. If we look at the rings on this tree, we can learn about the   9  for a hundred years. We can see  10  our climate is changing today.