上海高三英语11选10练习.doc

A.change B.connected C.constant D.drawn E.gaps F.illustrated G. journeys H.parallel I.purposefully J.simple In this section, children are introduced to botany and zoology, and to the life cycle. And the circle of life is _______ with the seasons, and the cycle of the seasons is explained. The help of the parent or teacher is much needed in explaining the seasons to young children. Most adults know that the seasons are not determined by the earths rotation, which _________ causes the daily cycle of light and dark. But _______ in our educational system have left many parents and teachers with a rather unclear understanding of the cycle of the seasons. Surveys show that many Americans think the earth is closer to the sun in summer than in winter. In fact, the earth is farthest away from the sun in our summer and closest in winter, though the difference in distance is of minor importance. It is the tilt(倾斜）of the earth on its axis(轴)(toward the sun in summer and away from the sun in winter) as it ________ around the sun that causes the seasonal ________ of winter and summer. To help children understand the seasons in North America, it will be most useful to use a physical model. Heres a simple suggestion for one. The seasonal relationship between the earth and the sun can be _______ to a child by putting a knitting needle through a tennis ball to act as the earth and its axis. On the surface of the tennis ball. The equator(赤道) should be ________ at right angles to the knitting needle. The tennis ball can then be circled around a burning light bulb in a plane(平面) _______ to the floor at the same height as the bulb, keeping the axis at a(n) _______ tilt toward the north. As the ball circles close to the bulb, the dark and light sides of the ball will be clearly seen, and so will the differences in light intensity on different parts of the ball. A.experience B.advance C. purpose D.secondary E. promptly F.satisfaction G.profi