If you left your book on the table overnight, you would find the following morning that it was still exactly when you had left it, provided nobody had moved it. If a ball is made to roll on a very smooth surface, it will roll a long distance unless something stops it or changes its direction. This tendency of an object to remain at rest unless something moves it and to continue moving unless something stops it is known as the Law of Inertia.
The following examples show the truth of this law.

• (a) Put a table-cloth on a table and arrange a pile of books on it. Hold one edge of the tablecloth and pull it quickly. The table-cloth will come off, leaving the pile of books undisturbed.
• (b) Place a small piece of cardboard on an open jar and place a coin on it directly over its mouth. Use one finger to flick the piece of cardboard away. You will notice that the coin drops into the jar.
• (c) Sitting in a car which starts suddenly, you feel you are jerked backwards. In fact, you are not jerked backwards. Your lower half, which is in contact with the cushion, is forced to move forward with the car, and the upper part of your body, which remained at rest, is left behind.

This passage, on the whole, is developed by ______.

A．time

B．space

C．process

D．example

指出下列各句的表达方式。

（1）生命是可爱的，但寒冷的寂寞的生、却不如轰轰烈烈的死。（     ）

（2）倘使有一双翅膀，我甘愿做人间的飞蛾。（     ）

（3）冬季的深夜，立在小小庭院中望见落了霜的地上的月色，觉得自己衣服上也积了很厚的霜似的。（     ）

（4）为追求光和热，将身子扑向灯火，终于死在灯下，或者浸在油中，飞蛾是值得赞美的。（     ）