世界卫生组织（WHO）将现代医学划分为（） A.基础医学 B.保健医学 C.预防医学

阅读短文，根据短文正断内容判误，正确的写 "T"，错误的写"F"。

   Amy has got a book about London. London is the capital of England. There are many interesting places

in the city. Buckingham Palace is very big and beautiful. The River Thames is long and wide. Big Ben is

very old and tall. Hyde Park is very beautiful. Tower Bridge is very famous and beautiful.

( ) 1. Amy has got a book about China.

(     ) 2. London is the capital of England.

(     ) 3. Buckingham Palace is very small, but it's very beautiful.

(     ) 4. The River Thames is wide and long.

(     ) 5. Hyde Park is very beautiful.

某校有960套桌凳需要维修．现有甲乙两个木工，甲单独修理这批桌凳比乙多用20天；乙每天比甲多修8套；甲乙每天的修理费分别是80元，120元．在修理桌凳过程中，学校要委派一名维修工进行质量监督，并由学校负担他每天10元的生活补助．现有以下三种修理方案共选择：

①由甲单独修理；

②由乙单独修理；

③由甲乙共同合作修理．

你认为哪种方案即省时又省钱？试比较说明．

如图甲是某物体运动的v-t图象，则图乙中能相应表示出该物体运动的s-t图象的是（   ）

PETG是一种新型材料，可回收利用，对环境不构成任何威胁，其结构简式如下：

已知：RCOOR₁＋R₂OH―→RCOOR₂＋R₁OH(R、R₁、R₂表示烃基)。采用如下图所示的合成路线可合成PETG：

试回答下列问题：

（1）上述各步反应中，属于取代反应的有__________(填写编号)。

（2）写出结构简式：B_____________________________、I_________________________。

（3）写出化学方程式：

反应④                                                       、

反应⑤                                                        。

（4）合成时应控制的单体的物质的量n (D)∶n (F)∶n (H)＝______________(用m、n表示)。

　　For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

　　Indoor air pollution can cause a person to feel tired, to suffer eye-pain, headache and other problems. Some pollutants（污染物） can cause breathing disorders, diseases of blood and even cancer, Most scientists agree that every modern house has some kind of indoor pollution. People began to notice the problem in the early 1970s. It is that when builders began making houses and offices they did not waste energy. To do this they built buildings that limited the flow of air between inside and outside. They also began using manmade building materials. These materials are now known to let out harmful gases. As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building— green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and through its tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square metres of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.

　　小题1:Generally speaking, indoor air pollution may be more harmful than the air outside because ________.

A．the man - made building materials let out dangerous gases inside houses

B．there may be more harmful gases outside houses

C．the flow of air indoors is limited

D．indoor air pollution can make a person seriously ill　　小题2:The most effective way to clean the air is to use different kinds of plants because________.

A．they may let out more oxygen which people need

B．they can absorb different kinds of the harmful indoor chemicals

C．they can take in all kinds of indoor pollutants

D．they can make your house prettier and more healthy