我国采用北京所在的东八时区的区时作为标准时间，称为北京时间，其发布地位于（ ）
A．北京天文台的授时中心
B．拉萨天文台的授时中心
C．甘肃酒泉的国家授时中心
D．西安临潼的国家授时中心
参考答案：D
解析：中国采用北京所在的东八时区的区时作为标准时间，称为北京时间，或称中原标准时间。北京时间并不是北京（东经116.4°）地方的时间，而是东经120°地方的地方时间。因东经120°正好穿过常州，所以常州当地时间与北京时间的误差最小。北京时间发布位于西安临潼的国家授时中心。
根据短文内容，填写下列表格。 “USA? Britain? Which country is better to study in?” We often hear such discussion. As China opens its door, studying abroad has become a dream for many Chinese students. They want to learn about the world. It’s true that studying abroad can help students develop themselves. Language skills will improve and it may be easier to find a job. But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language and getting used to a different culture. Students must also learn to live without parents’ care and deal with all kinds of things they haven’t had to do before, like looking after themselves. There are reports about Chinese students abroad sinking in an ocean of difficulties and giving up easily. When they have to take care of themselves, it is hard for the students to study well. Finally, studying abroad brings a heavy burden (负担) to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth it? We know that there are many famous people who succeed in great things through their hard work in China. Liu Xiang is a good example. Once an American teacher invited him there but he refused. He kept training hard with his Chinese teacher. He surprised the world when he won a gold medal at Athens Olympics. So when you wonder which country is better to study in, consider whether studying abroad is the right choice.
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