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How green are you? Do you know how to be green? We all need a healthy environment, but we produce waste every day and it does harm to our environment. Though we are young, we can still do something to help. In fact, even the simplest everyday activities can make a real difference to the environment. Here are some ideas for you. Reduce Reduce means “use less”. Don’t waste things. This saves money and reduces pollution and waste going into the environment. Before we buy something new, think whether it is really necessary—or maybe the old one will be just as good! When we do buy things, choose local products if possible, and try not to buy too many things from abroad. Reuse Reuse means “use again”. Use things for as long as possible. When we buy things, make sure that they last a long time. We should look after them so that they will last, and we should repair them if we can instead of throwing them away and buying new ones. Don’t use a paper cup of a paper bag. It’s better to use a china cup and a lunch box because you can use them again. Recycle Recycle means “change things into something else”. Though it takes energy to change something into something else, it’s better than throwing things away or burning them. Find out what can be recycled in your neighbourhood and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees. So please remember these three words: reduce, reuse and recycle. 小题1:What is the passage about? A.How to produce things. B.How to burn things. C.How to help others. D.How to be green. 小题2: Which of the following is right? A.Don’t waste things. B.Always throw away old things. C.Always buy new things. D.Buy too many things from abroad. 小题3:Why is it better to use a china cup and a lunch box? A.You can burn them. B.You can use them again. C.You can throw them away. D.You can change them into something else. 小题4:To protect the environment, we should remember these three words: _______. A.waste, reuse and recycle B.repair, burn and recycle C.reduce, reuse and recycle D.reduce, waste and recycle. 小题5: The passage may come from ______. A.a menu B.a dictionary C.a storybook D.a magazine
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【简答题】分析运动失败的历史原因。
【判断题】机体所需的能量来源于食物中的糖、脂肪、蛋白质和氨基酸。
A.
正确
B.
错误
【简答题】如图,已知点M(0,1),N(0,-1),P是抛物线y= x 2 上的一个动点。 (1)判断以点P为圆心、PM为半径的圆与直线y=-1的位置关系,说明理由; (2)设直线PM与抛物线y= x 2 的另一个交点为Q,联结NP、NQ,求证:∠PNM=∠QNM。
【单选题】已知P是抛物线 上的一个动点。点Q是圆 上的一个动点,N(1. 0)是一个定点,则|PQ |+|PN|的最小值为()
A.
3
B.
4
C.
5
D.
6
【简答题】已知椭圆C的中点在原点,焦点在x轴上,离心率等于 ,它的一个顶点恰好是抛物线 的焦点. (1)求椭圆C的方程; (2)己知点P(2,3),Q(2,-3)在椭圆上,点A、B是椭圆上不同的两个动点,且满足 APQ= BPQ,试问直线AB的斜率是否为定值,请说明理由.
【简答题】已知点M,N的坐标分别为(0,1),(0,-1),点P是抛物线 上的一个动点。 (1)求证:以点P为圆心,PM为半径的圆与直线y=-1的相切; (2)设直线PM与抛物线 的另一个交点为点Q,连接NP,NQ,求证:∠PNM=∠QNM。
【单选题】已知P为抛物线y 2 =4x上一个动点,Q为圆x 2 +(y-4) 2 =1上一个动点,那么点P到点Q的距离与点P到抛物线的准线距离之和的最小值是(  )
A.
2 5 -1
B.
2 5 -2
C.
17 -1
D.
17 -2
【简答题】已知椭圆C的中心在原点,焦点在x轴上,离心率等于 ,它的一个顶点恰好是抛物线 的焦点. (Ⅰ)求椭圆C的方程; (Ⅱ)P(2,3),Q(2,﹣3)是椭圆上两点,A、B是椭圆位于直线PQ两侧的两动点, (i)若直线AB的斜率为 ,求四边形APBQ面积的最大值; (ii)当A、B运动时,满足∠APQ=∠BPQ,试问直线AB的斜率是否为定值,请说明理由.
【单选题】已知P为抛物线 上一个动点,Q为圆 上一个动点,那么点P到点Q的距离与点P到 轴距离之和最小值是(  )
A.
B.
C.
【单选题】下列关于能量的来源叙述,错误的是( )
A.
机能能量来源于食物中糖、脂肪和蛋白质分子中蕴含的化学能
B.
糖和脂肪是机体重要的供能物质,蛋白质是机体主要的供能物质
C.
机体进行各种生理活动时直接利用的能量均来自ATP
D.
糖提供人体所需能量的50-70%
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