考研英语必背作文高分范文
导读：我根据大家的需要整理了一份关于《考研英语必背作文高分范文》的内容，具体内容：英语作文是我们在考研英语考试未进行的时候就必定会遇到的，这些我们都知道不是吗?下面是我给大家整理的考研英语必背作文，供大家参阅!考研英语必背作文：NOTICE三年级的英...
英语作文是我们在考研英语考试未进行的时候就必定会遇到的，这些我们都知道不是吗?下面是我给大家整理的考研英语必背作文，供大家参阅! 考研英语必背作文：NOTICE
三年级的英语老师张利从今天起请病假1周，通知1，2 班的同学 。一班周一3，4节的英语课调到周3的5，6节;2班周二1，2节的英语课到周4的5，6节。
请同学们按时上课，发通知者为教务处(DEANS OFFICE)时间为3月30日 NOTICE
Ms Zhang, the English teacher of Grade three, is leaving for a week because for sickness. Therefore, some adaption have to be made. Here are notice for you: Class1-- class on Monday courses3 and 4 change to Wednesday ourses 5and6.Class2--class on Tuesday courses1 and 2 change to Thursday courses5and6.Please prepare for the class. DEANS OFFICE 30th Mar
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考研英语必背作文：Topaz
Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the stone \topaz\The best-known precious topaz gems range in color from rich yellow to light brown or pinkish red. Topaz is one of the hardest gem minerals. In the mineral table of hardness, it has a rating of 8, which means that a knife cannot cut it, and that topaz will scratch quartz.
The golden variety of precious topaz is quite uncommon. Most of the worlds topaz is white or blue. The white and blue crystals of topaz are large, often weighing thousands of carats. For this reason, the value of topaz does not depend so much on its size as it does with diamonds and many other precious stones, where the value increases about four times with each doubling of weight. The value of a topaz is largely determined by its quality. But color is also important: blue topaz, for instance, is often irradiated to deepen and improve its color.
Blue topaz is often sold as aquamarine and a variety of brown quartz is widely sold as topaz. The quartz is much less brilliant and more plentiful than true topaz. Most of it is variety of amethyst: that heat has turned brown. NOTE:
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topaz / tэupжz; `topжz/ n (a) [U] transparent yellow mineral 黄玉(矿物).
(b) [C] semi-precious gem cut from this 黄玉; 黄宝石. 考研英语必背作文：Cohesion-tension Theory
Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree can pump water to its very top more than 100 meters above the ground. Until the end of the nineteenth century, the movement of water in trees and other tall plants was a mystery. Some botanists hypothesized that the living cells of plants acted as pumps. But many experiments demonstrated that the stems of plants in which all the cells are killed can still move water to appreciable heights. Other explanations for the movement of water in plants have been based on root pressure, a push on the water from the roots at the bottom of the plant. But root pressure is not nearly great enough to push water to the tops of tall trees. Furthermore, the conifers, which are among the tallest trees, have unusually low root pressures.
If water is not pumped to the top of a tall tree, and if it is not pushed to the top of a tall tree, then we may ask: how does it get there? According to the currently accepted cohesion-tension theory, water is pulled there. The pull on a rising column of water
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考研英语必背作文高分范文
