【名词&注释】
光合作用、有机物(organic compounds)、导电性(conductivity)、导热性(thermal conductivity)、氯化钾(potassium chloride)、绿色植物(green plant)、氧化铜(copper oxide)、电话号码(telephone number)、化学变化(chemical change)、干电池(dry battery)
[填空题]最简单的有机物
查看答案&解析
举一反三：
[单选题]下列实例中，材料的选用与描述的物理属性不相符的是（）
A. 热水壶的手柄用胶木制成，是因为胶木的导热性好
B. 划玻璃的刀头镶嵌有金刚石，是因为金刚石的硬度大
C. 输电导线的内芯用铜制成，是因为铜的导电性好
D. 房屋的天窗用玻璃制成，是因为玻璃的透光性好
[单选题]20．
A. hard
B. common
C. interesting
D. possible
[单选题]下列说法不正确的是（ ）
A. 干电池(dry battery)工作释放电能
B. 燃料燃烧时发生化学变化(chemical change)并放出能量
C. 绿色植物吸收太阳能进行光合作用
D. 面粉，蔗糖灼烧后都变成炭黑，说明它们是相同的物质
[单选题]AIf you go to a fast food restaurant．you will probably see a lot of teenagers． Today，many teenagers are overweight，and some of．this is because of their bad eating habits．， Most teenagers love food with a lot of fat，oil，salt，and sugar． People often call this kind of food "junk food"．
A. bad eating habits go beyond fast food． We find many teenagers eat unhealthily． Some don't have breakfast before they go to school． During the day，some don't have a proper meal for lunch． In a recent survey at one school，scientists found that over two-thirds of the students didn't follow a healthy diet． They didn't like vegetables，and many of them didn't like to eat fruits． They preferred to eat food with a lot of salt，sugar，or fat．
B. Some doctors give the ．following ad-vice :
D. Salt can cause high blood pressure(高血压) in the future．
G. Milk will help their bones grow．
H. This is good for their body and mind．
I. "Junk food" contains(包含) a lot of ________．
J. milk and sugar
K. fruits and sugar
L. vegetables and salt
M. fat，oil，salt and sugar
[单选题]What is a shortcoming of Armstrong’s work according to the author?
A. Some ideas are slightly contradictory.
B. There is too much discussion on studying science.
C. The style. is too serious.
D. It lacks new information.
[单选题]13．
A. What
B. How-s
C. What's
D. Is
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