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问题 选择题

如图，物体从A运动到C，以下说法正确的是（　　）

A．经1从A运动到C的位移最小

B．经2从A运动到C的位移是曲线

C．经3从A运动到C的位移最大

D．无论从那条运动，位移都相同

答案

由图看出，三个运动过程物体的起点与终点相同，根据位移是从起点到终点的有向线段可知，位移都相同，位移都是A→C．故D正确，ABC错误．

故选D

单项选择题

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Ｄ. EACH statement ALONE is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.

What is the value of f2-g2
(1) f=-g+8
(2) f=g-2
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单项选择题

患者，女，17岁，主诉咬苹果时苹果上有血迹，检查见前牙区后侧龈 * * 圆钝、深红色，探诊深度4mm，未探及附着丧失。该患者最可能的诊断是

A．急性龈 * * 炎
B．青少年牙周炎
C．慢性牙周炎
D．青春期龈炎
E．慢性龈缘炎
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