单选题
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 hooks 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 arc 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.
单选题
A book put on the table overnight would ______ the following morning.
【正确答案】
C
【答案解析】[解析] 本题考查细节理解。根据文章第一段第一句“If you left your book on the table overnight, you would find the following morning that it was still exactly where you had left it, provided nobody had moved it.”可知，本题答案是C。
单选题
A ball with a smooth surface made to roll on a very smooth surface would ______.
【正确答案】
C
【答案解析】[解析] 本题考查细节理解。根据文章第一段第二句“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.”可知，本题答案是C。
单选题
In this passage, inertia means ______.
【正确答案】
D
【答案解析】[解析] 本题考查细节理解。根据文章第一段最后一句“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.”可知，本题答案是D。
单选题
The Law of Inertia is a law concerning ______.
【正确答案】
A
【答案解析】[解析] 本题考查推理判断。根据The Law of Inertia的定义可知，本句话中的几个动词均表动作。所以，答案是A。
单选题
In the first example, the pile of books on the table-cloth will ______.
【正确答案】
C
【答案解析】[解析] 本题考查细节理解。根据文章第二段(a)中的最后一句“The table-cloth will come off, leaving the pile of books undisturbed(未受干扰的).”可知，桌布被抽掉了，但是书却不受干扰，即书还是待在原处。所以，答案是C。
单选题
In the second example, when the cardboard is flicked away, the coin will ______.
【正确答案】
A
【答案解析】[解析] 本题考查细节理解。根据文章第二段(b)中的最后两句“Use one finger to flick the piece of cardboard away. You will notice that the coin drops into the jar.”可知，用一根手指轻弹纸板后，硬币会掉到罐子里。所以，答案是A。
单选题
Sitting in a car which stops suddenly, you feel that you are ______.
【正确答案】
C
【答案解析】[解析] 本题考查细节理解。根据文章第二段(c)中的第一句“Sitting in a car which starts suddenly, you feel you are jerked backwards.”可知，如果坐在车里，车子忽然启动，人会向后仰。本题题干是stop suddenly，不是start suddenly，所以，车内的人应向前冲。因此，答案是C。
单选题
Which of the following is an example of inertia?
【正确答案】
D
【答案解析】[解析] 本题考查推理判断。根据第一段最后一句“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.”惯性的定义可知，四个选项中，只有D项荡秋千是人为的来回摆动属于惯性现象。所以，答案是D。
单选题
This passage, on the whole, is developed by ______.