Question

一艘船沿半圆路径从点 $A$ 到点 $B$ ，该半圆以岛 $X$ 为圆心。然后它沿直线路径从 $B$ 到 $C$ 。下列哪张图最能表示船沿路线移动时到岛 $X$ 的距离？

A ship travels from point $A$ to point $B$ along a semicircular path, centered at Island $X.$ Then it travels along a straight path from $B$ to $C.$ Which of these graphs best shows the ship’s distance from Island $X$ as it moves along its course?

答案：B

知识点：数据与图表解读圆

难度评级：1540

解答：

从 $A$ 到 $B$ 的半圆路径上每一点到圆心 $X$ 的距离都相同，所以图像一开始是水平的。

在从 $B$ 到 $C$ 的直线路径上，船先靠近 $X$ ，然后远离 $X$ 。

只有图 $B$ 先保持水平，然后下降再上升。

所以正确答案是 B。

Every point on the semicircular path from $A$ to $B$ is the same distance from the center $X$ , so the graph starts horizontally.

On the straight path from $B$ to $C$ , the ship first gets closer to $X$ and then farther away from $X$ .

Only graph $B$ starts flat and then decreases before increasing.

Thus, B is the correct answer.

2003 AMC 8 第 24 题

答案：B

难度评级：1540

解答：

其他年份的第 24 题