3．固定搭配的结构

It was this park that was full of history and fun.(强调结构)

As the destination is located in Fengtai in the southwest of Beijing, we had to spend one hour and a half getting there by bus. Upon arrival, we visited Lincoln Memorial.

We went to Beijing World Park, which lies in Fengtai in the southwest of Beijing, in order to see the world-famous architecture.　　

Yuan Longping is known as a pioneer of agriculture.　

Walking through the park was a feast for the eyes.　　

The whole world could benefit from his work.　　

His great contribution to agriculture is of great importance.　 .　　　　

Instead of being satisfied with his work, he was driven by a strong desire to continue to develop his rice.

For his great achievement, he was honored by Chinese government.

2. 复合句

(1)状语从句

The car hit the man when he was crossing the street.　 (时间)

As soon as we got to the campsite, we started to put up the tent and cook food.

Wherever I am, I will be thinking of you.　　　 (地点)

She took some books with her so that she would get bored during the long journey. (目的)

As long as we don’t lose heart, we will find a way to overcome the difficulty.(条件)

Although it is difficult, we will try our best to finish it on time.　 (让步)

(2)定语从句

Yuan Longping, who is a pioneer of agriculture，is called “the father of rice”.

We chose Beijing World Park as our destination, which lies in Fengtai in the southwest of Beijing.

(3)名词性从句

Where we are going this weekend hasn’t been decided.　　　 (主语从句)

My idea is that we should stick to our original plan.　 (表语从句)

The fact that the earth is seriously polluted is well-known.(同位语从句)

I don’t know whether Tom will come to the party tonight (宾语从句)

(4)非谓语动词

Surrounded by a variety of buildings, we found ourselves deeply absorbed in the sight.

We left the park feeling joyful.

Having graduated from Southwest Agriculture College in 1953, he devoted to finding ways to grow more rice.

It is unnecessary to argue with him about it.

The book explains how to solve the problem.

1. 简单句

Early in the morning, we set out at the school gate.

The Internet is becoming more and more important in our daily life.

Much of Canada is covered by forests, but in China the area of forest is much less.

We can send e-mails anywhere at any time and get the latest information through Internet.

英语写作中句子的表达

高考英语书面表达要求内容充实，句式丰富，用词准确，行文连贯，思路清晰，过渡自然。要想达到这一目的，句子的正确运用和表达是至关重要的。高考书面表达不仅要求学生正确运用语法规则，即结构完整，主谓一致，时态、语态准确，还要有效的使用并列、转折、递进、因果、比较等表达方式，同时“运用较多的语法结构和词汇”进行表达。

［学习过程］

3、若以ω₁和ω₂分别表示浓度为amol/L和bmol/L氨水的质量分数，有知2a=b，则下列推断正确的是(氨水的密度比纯水的小)

A、2ω₁=ω₂ B、2ω₂=ω₁ C、ω₂>2ω₁ D、ω₁<ω₂ <2ω₁

例4、25℃时，某物质(无结晶水)溶解度为Sg，其摩尔质量为Mg/mol，饱和溶液密度为dg/cm³，则其饱和溶液的物质的量浓度为(　　 )

A、mol/L B、mol/L

C、mol/L　　 D、mol/L

练习：将gNa₂CO₃•10H₂O晶体溶解在L水中，在相同的温度下配成密度为 g/cm³的饱和溶液，若用C表示该饱和溶液的物质的量浓度(mol/L)，A%表示质量分数，用S表示Na₂CO₃的溶解度g，则下列表示式正确的是(　　 )

A、　　　 B、100%

C、　　　　　　 D、

2、在100g浓度为18mol/L、密度为ρg/cm³的浓硫酸中加入一定量的水稀释成9mol/L的硫酸，则加入水的体积为(　　 )

A、小于100mL　　 B、等于100mL　　 C、大于100mL　 D、等于100/ρmL

3、质量分数不等的两种Na₂SO₄溶液等质量混合时，混合溶液的质量分数为a%，而等体积混合时为b%，质量分数不等的两种乙醇溶液等质量混合时，混合液的质量分数为a%，而等体积混合时为c%，则a、b、c的大小关系中(　　 )

A、a>b>c　　　 B、b > a >c　 C、c >a>b　　　 D、a> c > b

例3、已知98%的浓硫酸的物质的量浓度是18.4mol/L，则49%的硫酸溶液的物质的量浓度是(单位：mol/L)　　 (　　 )

A、等于9.2　　　 B、小于9.2　　 C、大于9.2　　 D、不能确定

练习：1、已知质量分数为95%的酒精溶液的物质的量浓度为16.52mol/L试判断47.5%酒精溶液的物质的量浓度为(　　　 )

A、大于8.26mol/L　 B、等于8.26mol/L　 C、小于8.26mol/L　 D、无法判断

2、已知甲、乙溶质质量分数与密度的关系如下表：

甲物质的1%的溶液与9%的溶液等体积混合, 乙物质的1%的溶液与9%的溶液等体积混合后,下列叙述正确的是(　　 )

A、 混合后甲、乙溶液质量分数均大于5%

B、 混合后乙溶液质量分数大于5%，甲溶液质量分数小于5%

C、 混合后甲溶液质量分数大于5%，乙溶液质量分数小于5%

D、 混合后甲、乙溶液质量分数均等于5%

例1、常温时A的物质的溶解度为15g，B物质的饱和溶液的质量分数为15%，而浓度为15%的C物质的溶液100g，蒸发掉15g水，恢复到常温时析出晶体1g，则此三种物质在常温时的溶解度S_A、S_B、S_C由大到小的顺序正确的是(　 )

A、S_A>S_B>S_C B、 S_C>S_B>S_A 　C、 S_C> S_A>S_B　D、S_C =S_B>S_A

练习：1、某温度下，甲、乙两个烧杯中各盛有100g相同浓度的KCl溶液，现将甲烧杯中的溶液蒸发掉35g水，析出晶体5g，乙烧杯中溶液蒸发掉45g水，析出晶体10g，则原溶液中KCl的质量分数为(　　 )

A、10%　　　 B、15%　　　 C、20%　　　 D、25%

2、t℃时，将一定质量的某物质的不饱和溶液分成三份，分别加热蒸发溶液，然后把温度降至t℃，已知从三份溶液中蒸发的溶剂质量分别为10g、20g、30g，析出晶体(不含结晶水)质量分别为a、b、c(单位g，且a、b、c均大于零)，则a、b、c三者的关系为(　　 )

A、c=2b-a　　　 B、c=a+b　　 C、c=a+2b　　　 D、c=2a+b

例2：密度为0.91g/cm³的氨水,质量分数为25%,该氨水用等体积的水稀释后,所得溶液的质量分数为(　　 )

A、等于12.5%　　　 B、大于12.5%　　　 C、小于12.5%　　 D、无法确定

练习：1、把质量分数为70%的HNO₃(密度为1.40g/cm³)加到等体积的水中，稀释后硝酸溶液中溶质的质量分数为(　　 )

A、35%　　　 B、大于35%　　　 C、小于35%　　　 D、≤35%

4、以上各量间的综合计算