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    China's boss of table tennis Liu Guoliang was shocked at his first sight of Japanese teenager Miu Hirano who beat three top-ranked Chinese to claim a sensational victory of the women's singles at the Asian Table Tennis Championships.

    "She's much better than I had imagined," said Liu, on the conclusion of the continental tournament（锦标赛）. "When she came out the winner of last year's World Cup, I thought maybe she took advantage of the absence of the Chinese women paddlers. However, I changed my mind when I saw her play here. She's strong enough technically and mentally, and capable of beating any one in the world," added Liu.

    Hirano, who just turned 17 years old on Friday, stunned China's world No. 1 Ding Ning 3-2 in the quarterfinals before second-ranked Zhu Yuling 3-0 and finally seeing off world No. 5 Chen Meng, also 3-0, to smash the Chinese dominance（统治）of the tournament.

    "She's so young and has so many possibilities in the future," said Liu. "That makes her success more intimidating to our women's team."

    In Liu's opinion, the difficulties that China faced in these Asian championships reflected the changes of table tennis world map in recent years.

    "It's not just recently that Japan wants to beat China," he said. "By the end of the day, their efforts finally worked out."

    The head coach, however, refused to stand all by the Japan's side. "We do need to learn from the other associations, including the Japanese, who do an excellent job on youth training," Liu said. "But one failure should not lead to the whole denial to our own team. I think it's a good thing to have competitors who can pose real challenges, which makes our sport more competitive and more healthy," he added.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

在极坐标系中曲线 $C_1$ 的方程是 ${\rho }^2\left(1+3{\text{sin}}^2\theta \right)=16$ ，点 $P$ 是 $C_1$ 上的动点，点 $M$ 满足 $\stackrel{\rightharpoonup }{OP}=2\stackrel{\rightharpoonup }{OM}$ （ $O$ 为极点），点 $M$ 的轨迹为曲线 $C_2$ ，以极点 $O$ 为原点，极轴为 $x$ 轴的非负半轴建立平面直角坐标系 $xOy$ ，已知直线 $l$ 的参数方程是 $\text{{}\begin{array}{c}x=3+t\\ y=2t\end{array}$ ，（ $t$ 为参数）．

（Ⅰ）求曲线 $C_2$ 直角坐标方程与直线 $l$ 的普通方程；

（Ⅱ）求点 $M$ 到直线 $l$ 的距离的最大值．

加偏旁组成新字，再组词。

口→（和） （和平）

下→____ ____

求→____ ____

公→____ ____

北京时间2015年7月24日，美国航天局宣布，一颗1400光年外的行星(开普勒452b，即：地球2.0)可能是最像地球的宜居行星。它围绕一颗与太阳相似的恒星旋转，距离刚好处于“宜居带”中，它的体积比地球大60%，公转周期为385天。这是迄今为止发现的与日地最相近的恒星和行星组合。开普勒452b之所以被称为地球2.0，最主要的原因是（    ）