分子为1的组合单位的符号采用什么形式？举例说明。

硝酸是一种强氧化性、腐蚀性的强酸，其还原产物因硝酸浓度的不同而有变化，从总体上说，硝酸浓度越高，平均每分子硝酸得到的电子数越少，浓硝酸的还原产物主要为NO₂，稀硝酸的还原产物主要为NO。 实验室中，常用Cu与浓HNO₃反应制取NO₂，用Cu与稀HNO₃反应制取NO。

（1）请写出实验室中用Cu与浓HNO₃反应制取NO₂的化学方程式：_____________。

（2）该反应中发生氧化反应的物质是__________，1 mol氧化剂_________(填“得到”或“失去”)_______ mol电子。

（3）48.0 g Cu与适量的浓HNO₃反应，铜全部作用后，共收集到22.4 L气体(标准状况下)，反应中消耗HNO₃的物质的量可能是（   ）

A．1.5 mol        B．2.0 mol        C．2.5 mol        D．3.0 mol

（4）实际上硝酸不仅可被还原为NO₂或NO，浓度更稀时硝酸还可以被还原为N₂O、N₂、NH₄NO₃等。请将3种物质： FeSO₄、Fe(NO₃)₃和Fe₂(SO₄)₃分别填入下面对应的横线上，组成一个未配平的化学方程式。

HNO₃  ＋  ______    ______ ＋  ______ ＋  N₂O↑ ＋  H₂O

并写出配平后的离子方程式：_________________________。

（5）硝酸的还原产物NO、NO₂、N₂O等对环境均有副作用，为了可持续发展，当今社会提出的一个新概念——“绿色化学”，它要求从经济、环保和技术上设计可行的化学反应，则下列由单质铜制取硝酸铜的方法可行且符合“绿色化学”的是（   ）

A．Cu Cu(NO₃)₂

B．Cu CuOCu(NO₃)₂

C．Cu CuOCu(OH)₂Cu(NO₃)₂     

D．CuCuSO₄Cu(NO₃)₂

平胃散的药物组成不包括

A．厚朴

B．柴胡

C．陈皮

D．苍术

E．甘草

A shopping center is a place where many different shops and stores are collected under one roof. You can buy everything there and there are also banks, restaurants and, sometimes, a post office.

There are other places in the United States which are called five-and –ten-cent stores because they used to sell things for 5 to 10 cents. Today they sell almost anything and some of the things cost several dollars. Supermarkets are found in all the cities. They sell food and many other goods. You walk around the supermarket, choose the things you want, put them into a special basket prepared by the store and pay for them all together at the door. Supermarkets often stay open later than other stores.

Stores are usually open every day of the week except on Sunday. Some close on Saturdays in July and August.

小题1:The shops and stores in a shopping center are         .

A．in the same building

B．on the top of a big roof

C．close to your house

D．near banks and restaurants小题2:A five-and-ten-cent store usually sells         .

A．expensive things

B．small and cheap things

C．things worth many dollars

D．everything you need in the house小题3:________have baskets ready for people to carry the things they are going to buy.

A．Shopping centers

B．Fine stores in America

C．Five-and-ten-cent stores

D．Supermarkets小题4:Which of the following can be the topic of the article?

A．What a shopping Center is?

B．Why people like supermarkets?

C．Three types of places for shopping.

D．Old and new stores.

关于气雾剂的缺点下述错误的是（）

A.需要特殊的耐压容器、阀门系统和生产设备

B.抛射剂的高度挥发性具有制冷效应，会导致刺激和皮肤不适

C.氟氯烷烃在体内达一定浓度时可致敏心脏

D.气雾剂长期使用对心脏没有影响

E.气雾剂对心脏病患者不适宜

切削加工性