按要求写作，下面两个题目，任选一题完成。

       题目一：声音，虽然是用来听的，但是一旦注入了情感，就变得有分量。请你以“这样的声音”为题，写一篇不少于600字的文章。

       题目二：中国藏书楼的历史，是中国图书事业史的主体，有其独特的价值和影响。百年后，未来的藏书楼会是怎样的呢？请你展开想象，以“未来的藏书楼”为题，写一篇不少于600字的记叙文。

       要求：①将题目抄写在答题卡上。②不限文体（诗歌除外）。③字数不少于600字。④不要出现所在学校的校名或师生姓名。

想一想，填一填。

清澈的____       雪白的____       新鲜的____

How do we know the weather? We learn it on the radio and TV every day. Different countries have different weather. For example, the weather in Australia is different from that in China. Because the seasons in Australia are the opposite. Its summer is from December to February. But in our country, it's winter this time. And its winter is in June, July and August. So when it's spring in China, it's autumn in Australia. Isn't it interesting?

如图所示的电路中，电源的电动势为E，内阻为r．当可变电阻的滑片P向b移动时，电压表V₁的示数U₁与电压表V₂的示数U₂的变化情况是（   ）