雾霾问题已经引起社会公众的高度关注．下列人类活动中，会加重雾霾的是（　　）

根据短文内容，选择最佳答案。
    “Did you hear what happened to Adam Last Friday?” Lindsey whispers to Tori.
    With her eyes shining, Tori brags, “You bet I did, Sean told me two days ago.”
    Who are Lindsey and Tori talking about? It just happened to be yours truly, Adam Freedman. I can tell you that what they are saying is (a) not nice and (b) not even true. Still, Lindsey and Tori aren't very different from most students here at Linton High School, including me. Many of our conversations are gossip(闲话). I have noticed three effects of gossip: it can hurt people, it can give gossipers a strange kind of satisfaction, and it can cause social pressures in a group.
    An important negative effect of gossip is that it can hurt the person being talked about. Usually, gossip spreads information about a topic-breakups, trouble at home, even dropping out-that a person would rather keep secret. The more embarrassing or shameful the secret is, the juicier the gossip it makes. Probably the worst type of gossip is the absolute lie. People often think of gossipers as harmless, but cruel lies can cause pain.
    If we know that gossip can be harmful, then why do so many of us do it? Theanswer lies in another effect of gossip: the satisfaction it gives us. Sharing the latest rumor(传言) can make a person feel important because he or she knows something that others don't. Similarly, hearing the latest rumor can make a person feel like part of the “in group.” In other words, gossip is satisfying because it gives people a sense of belonging or even superiority(优越感).
    Gossip also can have a third effect: it strengthens unwritten, unspoken rules about how people should act. Professor David Wilson explains that gossip is important in policing behaviors in a group. Translated into high school terms, this means that if everybody you hang around with is laughing at what John wore or what Jane said, then you can bet that wearing or saying something similar will get you the same kind of negative attention. The dos and don'ts conveyed through gossip will never show up in any student handbook.
    The effects of gossip vary depending on the situation. The next time you feel the urge to spread the latest news, thing about why you want to gossip and what effects your “juicy story” might have.

生态系统中的物质循环发生在（　　）

中国古代地方行政区划历经几度变迁。秦汉主要有郡、县两级，唐代为道、州、县三级，宋代设置为路、州、县三级。元朝时期，行省成为最高地方行政区划，下设路、府、州、县。以上现象反映的本质是（    ）

At weekends in Chengdu, you can often see many people ________ outside some restaurants, __________to have dinners