下列说法中正确的是(    )

在公路的十字路口，红灯拦停了很多汽车，拦停的汽车排成笔直的一列，最前面的一辆汽车的前端刚好与路口停车线相齐，相邻两车的前端之间的距离均为L=6.0m，若汽车起动时都以a=2.5m/s²的加速度作匀加速运动，加速到v=10.0m/s 后做匀速运动通过路口．该路口亮绿灯时间t=40.0s，而且有按倒计时显示的时间显示灯． 另外交通规则规定：原在绿灯时通行的汽车，红灯亮起时，车头已越过停车线的汽车允许通过．请解答下列问题：

我市进行防空演练时，那种尖锐刺耳的防空警报声是通过 ____传入耳朵的，这样尖锐刺耳的声音平时我们说它是一种____，但这次它却向大家传递着一种 ____。

阅读理解。

    Home Alone is a very funny 1990 American film. It tells us a boy who is left at home alone by accident.

    One night before Christmas, McAlister family meet at their house. They are planning to fly to Paris for the holiday and are busy getting ready. Eight-year-old Kevin is the youngest child and he is fighting with his brothers, sisters and cousins. When he goes to bed, he is so angry that he wishes all his family would go away. In the morning, everyone wakes up very late. They are all in hurry to get to the airport, so they forget Kevin and he is left alone at home.

    Although Kevin is alone, he is very happy at first. His terrible family have gone---his wish has come true. He watches TV, eats lots of fast food and play games. He has a good time. But later on, he goes out and hears two bad men called Harry and Lary. Many things in the house get broken as Kevin tries to stop them. Finally, the police come and the men are taken away.

    The house is now in a mess, so Kevin tidies it up and waits for his parents. They get back from Paris and are very happy to find that Kevin is safe.

下面语段中划线的词语，使用不恰当的一项是
虽然国家对“低碳”理念大力宣传，同时有关部门也制定并颁布了相关的法律法规对行业的“低碳”标准进行了规范，但我们许多生产“环保、低碳”产品的企业不重视产品的宣传，以致产品虽好却无人问津。企业应该如何改变这种局面呢？首先，企业的高层要有高山仰止的战略眼光。其次，立即开展品牌宣传。现在不是“人怕出名猪怕壮”的时代了，你如果还顾虑重重，就只能被淘汰出局。