人们生活中的衣、食、住、行均与化学有着密切的联系．

（1）蛋白质是构成人体细胞的基础物质．下列食品中富含蛋白质的是____ （填标号）．

A．鱼肉      B．牛奶      C．猪油      D．蔬菜

（2）有一种面料叫“冰蚕丝”的衣服，其主要成分为合成纤维．用化学方法鉴别“冰蚕丝”和天然蚕丝：____．

（3）甲醛（CH₂O）是一种____（选填“有机物”或“无机物”），有剧毒且能致癌．用含有甲醛的材料装修房子，人进入后会闻到特殊气味，这主要与甲醛分子____有密切关系，因此新装修的房子最好通风透气一段时间后才入住．

（4）无人驾驶汽车处理系统的核心材料是高纯度的硅．工业制硅的反应之一如下：2X+SiCl_4​Si+4HCl．该反应中，X的化学式是____ ．

根据材料内容，选择正确答案。

Come to Austria(奥地利)

    Soll is a village in the mountains in western Austria. And the Post Hotel is clean and inexpensive. It is opened by a local family. From the hotel you can see the whole village, the forests and the mountains. Temperatures in summer are usually 20℃ to 25℃ in the daytime, but much cooler by evening.

Enjoy Thailand(泰国)!

    When you visit Bangkok in Thailand, don't miss the early morning river boat trip to the Floating(漂浮) Market just outside the city. There you will find many kinds of fruits and vegetables. And you can pay for them when you sit in your boat. Don't forget your hat: the sun can be strong and it may be as hot as 40℃ at noon.

Visit Hawaii!

    Maybe the most beautiful place in Hawaii is Kauai. You can visit its long, sandy beaches in the south and west of the island, and mountains and forests in the north, but don't be surprised if it rains in the centre of the island. Daytime temperatures there are usually around 24℃ to 26 ℃ by the sea, and only a little cooler by late evening.

阅读下列材料

材料一：从1921年开始，在列宁的领导下，国家停止实行战时共产主义政策，开始允许多种经济并存，农民向国家交了粮食税以后，余粮归自己支配。除大型企业仍然由国家管理外，允许私人和外国资本家经营一些中小型企业；废除生活必需的配给制，恢复自由贸易，大力发展商品经济。

材料二：《全国工业复兴法》规定了各企业的生产规模、价格水平、市场分配、工资水平和工作日时数，规定工人具有集体谈判的权利，规定了资本家必须接受的最高工作时数和应付工资额。