问题 单项选择题

首读率是条码识读系统的一个综合性指标,它与以下哪种因素无关()

A.条码符号印刷质量

B.译码器的设计

C.光电扫描器的性能

D.厂商的代码

答案

参考答案:D

阅读理解

   Many people are so busy these days that they have no time to cook at home. This becomes a problem because most families love home cooking! The food tastes good and a family meal can bring everyone together. In some families, meals are often the only chance everyone gets to see each other at the same time during the day.

Another reason people enjoy home cooking is that it is a way of showing love. A parent who makes some cookies is not just satisfying a child’s sweet tooth. He or she is sending a message (信息). The message says, “I care about you enough to spend an hour making cookies that you will eat up in 15 minutes if I let you.” There is also something about the smell of home cooking. The smell of cooking makes people happy. It makes most of us feel good and loved--even if we’re the ones doing the cooking! Next time you smell a cake making, stop for a moment and pay attention to your mood (心情,心境).

小题1:Why do many people have no time to cook?

A.Because they haven’t many things to do.

B.Because many people are too busy.

C.Because people don’t like home cooking.

D.Because they are too tired to cook.小题2:Home cooking is __________.

A.good and warm

B.a way of showing love

C.satisfying a child’s tooth

D.Both A and B小题3:The writer thinks the smell of home cooking _____________.

A.makes us feel good and loved

B.makes us be interested in cooking

C.makes us excited

D.makes us love others小题4:What’s the main idea of the passage?

A.Home cooking is important.

B.Home cooking feels good and loved.

C.People are too busy to cook.

D.Home cooking cookies taste better.

填空题

自然界各种资源为我们人类提供了赖以生存和发展的基础,我们 要珍惜和爱护,合理地开发利用。

(1)为防止空气中CO2含量增加带来的温室效应,法国化学家Paul Sabatier提出CO2甲烷反应。该反应使CO2和H2在催化剂作用下生成CH4和H2O,试写出该反应的化学方程式为                  

(2)金属及合金种类繁多,金店里有两种不同的“白金”, 一种是金、镍、铜、锌的合金,称为白色金;另一种是铂金,铂是一种银白色的贵重金属,用于耐腐蚀的化学仪器及首饰等,俗称“白金”[platinum]------元素符号Pt。鉴别两种白金,可采用的方法是              ;Cu的化学性质较为稳定,与稀硫酸不能直接反应,但滴加H2O2溶液并加热,能生成水和一种蓝色溶液。则该反应的化学方程式为                  

(3)海洋是一个巨大的资源宝库。海水中含量最高的盐是              ,海水经            结晶可获得粗盐。粗盐中含有少量的泥沙等不溶性杂质,实验室里可通过下列步骤制取精盐:溶解→             →蒸发(填写操作步骤)。蒸发时玻璃棒的作用是                。

(4)煤和石油是重要的化石燃料,其燃烧的条件是氧气和              ;用煤和石油还可以生产许多的合成材料,下列学习用品主要用合成材料制成的是               。 ①透明三角板 ②小刀 ③橡皮 ④铅笔 ⑤白纸 ⑥塑料垫板