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问题 选择题

选出下列加点字注音全对的一项（       ）

A．悚然（sǒng）坍圮(tān) 朱拓（tuò）

B．新正（zhèng）倔强（jiàng）炮烙（lào）

C．监生（jiàn）歆享（xīn）亘古不变(gèng)

D．形骸（hái）谬种（miù）熨帖(yù)

答案

答案：D

A.朱拓（tuò）（改：tà）

B炮烙（lào）（改：luò）

C.亘古不变(gèng) （改： gèn）

解答题
求出一个数学问题的正确结论后，将其作为条件之一，提出与原来问题有关的新问题，我们把它称为原来问题的一个“逆向”问题．
例如，原来问题是“若正四棱锥底面边长为4，侧棱长为3，求该正四棱锥的体积”．求出体积
16
3
后，它的一个“逆向”问题可以是“若正四棱锥底面边长为4，体积为
16
3
，求侧棱长”；也可以是“若正四棱锥的体积为
16
3
，求所有侧面面积之和的最小值”．
试给出问题“在平面直角坐标系xoy中，求点P（2，1）到直线3x+4y=0的距离．”的一个有意义的“逆向”问题，并解答你所给出的“逆向”问题．
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单项选择题

Taiwan police cannot decide whether to treat it as an extremely clever act of stealing or an even cleverer cheat. Either way, it could be the perfect crime, because the criminals are birds homing pigeons!
The crime begins with a telephone message to the owner of a stolen car: if you want the car back, pay up. Then, the ear owner is directed to a park, told where to find a bird cage and how to attach money to the neck of the pigeon inside. Carrying the money in a tiny bag, the pigeon flies off.
There have been at least four such pigeon pick ups in Changwa. What at first seemed like the work of a clever stay at home car thief, however, may in fact be the work of an even lazier and more inventive criminal mind—one that avoids not only collecting money but going out to steal the car in the first place. Police officer Chen says that the criminal probably has pulled a double trick: he gets money for things he cannot possibly return. Instead of stealing cars, he lets someone else do it and then waits for the car owner to place an ad in the newspaper asking for help.
The theory is supported by the fact that, so far, none of the stolen cars have been returned. Also, the amount of money demanded—under 3,000 Taiwanese dollars—seems too little for a car worth many times more.
Demands for pigeon delivered money stopped as soon as the press reported the story. And even if they start again, Chen holds little hope of catching the criminal. "We have more important things to do", he said.

We may infer from the text that the criminal knows how to reach the car owners because ______.

A．he reads the ads in the newspaper
B．he lives in the same neighborhood
C．he has seen the car owners in the park
D．he has trained the pigeons to follow them
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