Hello, listeners. Welcome to Henton Hospital Radio. Before our music program begins, I'm going to repeat some of our hospital rules.

    The hospital can sleep 800 patients. There are 8 beds in each ward（病房). The visiting hours are in the afternoon from 2: 30 to 3: 30 and in the evening from 7: 00 to 8: 00. But remember only two visitors at a time. Sorry about that, but you can see what would happen if we didn't have these rules.

    The other rules are about our time schedule. We start quite early-you might not be used to that. We wake you at 6 o'clock, and breakfast is at 8 o'clock, lunch at noon. There's tea at 3:30 and supper is at 6 o'clock.

    You can see the "No Smoking" sign-we don't allow smoking in the wards. I'm sure you understand why. However, if you do need to smoke, there are some smoking-rooms for you.

    You will find the radio switch(开关) on the wall near your bed, with your own headphones, if you want to listen. It's our own hospital radio wishing you a quick recovery(康复).

The children are having fun _________ on the beach（海滩）.

氢化亚铜（CuH）是一种难溶物质，用CuSO₄溶液和“另一物质”在40﹣50℃时反应可生成它．CuH具有的性质有：不稳定，易分解，在氯气中能燃烧；与稀盐酸反应能生成气体：Cu⁺在酸性条件下发生的反应是：

2Cu⁺=Cu²⁺+Cu．

根据以上信息，结合自己所掌握的化学知识，回答下列问题：

（1）在CuSO₄溶液和“另一物质”制CuH的反应中，用氧化还原观点分析，这“另一物质”在反应中所起的作用是____ （填氧化剂或还原剂）．

（2）写出CuH在氯气中燃烧的化学反应方程式　____ 

（3）CuH溶解在稀盐酸中生成的气体是____ （填化学式）

（4）如果把CuH溶解在足量的稀硝酸中生成的气体只有NO，请写出CuH溶解在足量稀硝酸中反应的离子方程式　____ ．

春节期间，黑龙江白雪皑皑，海南却已春耕大忙，造成这一差异的主要原因是（    ）