体育课时，同学们对“铅球”的制作材料进行讨论，有的同学认为“铅球”是铁制的，并从实验室借来吸铁石吸一下，“吸一下”这一过程属于科学探究中的（    ）

在“全民读书月”中，光明中学举行了“名著书评”活动，同学们写出了许多高度概括、语言精炼的书评，读罢令人同味无穷，拍案叫绝。例如：

《伊索寓言》：简洁的故事蕴含着深刻的道理，给人以思想的启迪。

《格列佛游记》：清新的文字，奇异的想像，辛辣的讽刺，将读者带入一个奇异的幻境。

请仿照以上书评的形式，在下列名著中任选一部写上精彩的短评。（可从作品的主题思想、主要内容、艺术特色以及自己的阅读感受等方面来写）

①《钢铁是怎样炼成的》：____。

②《骆驼祥子》：____。

点P（-3，1）在椭圆$C:\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\left(a>b>0\right)$的左准线上,过点P且方向为$\overrightarrow{a}$=（2，-5）的光线经直线y=－2反射后通过椭圆的左焦点，则此椭圆离心率为(    ）

    Earth Day is an event ____ (annual) celebrated on April 22.____ (found) by Senator Gaylord Nelson, an American politician and environmentalist, it was originally aimed at helping the public to know the current situation of pollution and ____ (get) people to care about the earth.

    In 1962, Rachel Carson's bestseller “Silent Spring” created an ____ (aware) of the dangerous effects of pesticides(农药）. Then, a fire,____broke out in 1969 on Cleveland's Guyahoga River, revealed the problem of chemical pollution in water. Senator Gaylord Nelson dreamed of____similar event that would get people to take environmental issues seriously. In 1969, he was inspired by protests against the Vietnam War and came up with the idea for Earth Day.

    In the fall of 1969, Nelson announced it and appealed to the entire country to get involved. Consequently, telegrams, letters and telephone calls ____ all over the country poured in. Since 1970, Earth Day celebrations have grown. Later, Nelson____(award) the Presidential Medal of Freedom because of his work.

    Today, numerous communities celebrate Earth Week, an entire week of____(activity) focused on the environmental issues. In 2017, the March for Science ____(occur) on Earth Day and was followed by the People's Climate Mobilization on April 29.