人工合成的植物激素类似物常用于生产实践。某课题组研究了激素类似物甲和激素类似物乙对微型月季生根和侧芽生长的影响，请回答下列问题：
由图1的结果（）(填“能”或“不能”)判断0.5 μmo1/L的激素类似物乙对生根的影响。为探究3 μmol/L的激素类似物甲和0.5 μmo1/L的激素类似物乙对微型月季插条生根的复合影响，应设计（）种培养基。
参考答案：不能；4
| 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. 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 table-cloth 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. |
In the first example, the pile of books on the table-cloth will ______.
A．be broken into pieces
B．scatter onto the ground
C．remain in its position of rest
D．be wrapped in the table-cloth