题目

小明通过学习得知：一般情况下，水的质量一定时，加入食盐的质量越多，溶液的浓度就越高。他想探究食盐水溶液的导电性能与什么因素有关。小明的猜想是：a．食盐水溶液的导电性能与溶液的浓度有关。b．食盐水溶液的导电性能与金属片之间的距离有关。c．食盐水溶液的导电性能与溶液的温度有关。小明利用水、食盐、烧杯、小勺子、电源、刻度尺、小灯泡、金属片、 (第9题)酒精灯等器材，设计了如图所示的装置，进行了探究实验。他记录的Looking back on my childhood. I am convinced that naturalists are born and not made. Although we were brought up in the same way, my brothers and sisters soon abandoned their pressed flowers and insects. Unlike them, I had no ear for music and languages. I was not an early reader and I could not do mental maths.      Before World War I we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparents, aunts, uncles and cousins who gathered next door. But I do have a crystal clear memory of dogs, the farm animals, the local birds and above all, the insects.   I am a naturalist, not a scientist. I have a strong love of the natural world, and my enthusiasm has led me into varied investigations. I love discussing my favorite topics and enjoy burning the midnight oil reading about other people’s observations and discoveries. Then something happens that brings these observations together in my conscious mind. Suddenly you fancy you see the answer to the riddle. Because it all seems to fit together .This has resulted in my publishing 300 papers and books. Which some may light honor, with the title of scientific research.   But curiosity, a keen eye, a good memory and enjoyment of the animal and plant world do not make a scientist? One of the outstanding and essential qualities required is self-discipline, a quality I lack. A scientist can be made a naturalist. If you can combine the two, you get the best of both worlds.  1.According to the author, a born naturalist should first of all be _____            A. full of ambition               B. self-disciplined C. full of enthusiasm           D. knowledgeable  2.The first paragraph tells us that the author _____ A. lost his hearing when he was a child B. didn’t like his brothers and sisters C. was interested in flowers and insects in his childhood D. was born to a naturalist’s family 3.The author says that he is a naturalist rather than a scientist probably because he thinks he __     .  A. just reads about other people observations and discoveries. B. Lacks some of the qualities required of scientist. C. Has a great deal of trouble doing mental arithmetic. D. Come up with solutions in most natural ways. 4.The author can’t remember him relatives clearly because__ A. He didn’t live very long with them B. He was too young when he lived with them. C. The family was extremely large. D. He was fully occupied with observing nature. 5.Which of the following statements is true? A. The author believes that a born naturalist cannot be scientist.  B. The author read a lot of books about the natural world and oil industry C. The author’s brothers and sisters were good at music and languages. D. The author spent a lot of time working on riddles.