传染病是由病原体引起的，病原体可以是细菌、病毒或寄生虫．（判断对错）

一只跳蚤在第一象限及x轴、y轴上跳动，在第一秒钟时， 它从原点跳动到(0，1)，然后接着按图中箭头所示方向跳动即(0，0)→(0，1) →(1，1) →（1，0）→…，且每秒跳动 一个单位，那么第35秒时跳蚤所在位置的坐标是（   ）

如图，抛物线y=ax²+bx+2与直线l交于点A、B两点，且A点为抛物线与y轴的交点，B（﹣2，﹣4），抛物线的对称轴是直线x=2，过点A作AC⊥AB，交抛物线于点C、x轴于点D．

阅读下面短文，从短文后所给的A、B、C、D四个选项中选出最佳选项。

    The second season of the popular Chinese singing contest "The Voice of China" was launched Wednesday in Beijing.           

    Hosted by Zhejiang TV, the show is based on "The Voice of Holland." The first season invited four famous singers as coaches (导师), Yang Kun, Na Ying, Liu Huan and Harlem Yu. The winner was Liang Bo, a 21-year-old man from Jilin.

The choice of the coaches for the second season has not been decided yet, according to Jin Lei, the show's director. He said they planned to invite pop singers Faye Wong, Jacky Cheung, Andy Lao and Liu Huan, to be this year's coaches, but it hadn't been decided yet. And he said they were looking for contestants from around the world and they planned to choose 300 for the show.

    In the first season, the four coaches chose teams of contestants through a listening process with their backs to the contestants. If two or more judges wanted the same singer, the singer had the final choice of his or her coach. Finally, the contestants competed in later battles.

    For the second season, there will be changes in the process. One change is that coaches may still have the chances to choose their favorite contestants in the later battles.