新托福考试写作想拿高分必背范文：Bacteria

1、 智 课 网 托 福 备 考 资 料 新托福考试写作想拿高分必背范文：Bacteria新托福考试写作考生想拿高分，“肚子里必须有点墨水”，背上一篇两篇优秀范文，以备不时只需。以下这篇范文的题目是：Bacteria。Bacteria are extremely small living things. While we measureour own sizes in inches or centimeters, bacterial size is measuredin microns. One micron is a thousandth of a millimeter: a pinheadis

2、 about a millimeter across. Rod-shaped bacteria are usuallyfrom two to four microns long, while rounded ones are generallyone micron in diameter. Thus if you enlarged a roundedbacterium a thousand times, it would be just about the size of apinhead. An adult human magnified by the same amount wouldbe

3、 over a mile (1.6 kilometer tall.Even with an ordinary microscope, you must look closely tosee bacteria. Using a magnification of 100 times, one finds thatbacteria are barely visible as tiny rods or dots. One cannot makeout anything of their structure. Using special stains, one can seethat some bact

4、eria have attached to them wavy-looking “hairs”called flagella. Others have only one flagellum. The flagellarotate, pushing the bacteria through the water. Many bacterialack flagella and cannot move about by their own power, whileothers can glide along over surfaces by some little- understoodmechani

5、sm.From the bacteria point of view, the world is a very differentplace from what it is to humans. To a bacterium water is as thickas molasses is to us. Bacteria are so small that they areinfluenced by the movements of the chemical molecules aroundthem. Bacteria under the microscope, even those with

6、no flagella,often bounce about in the water. This is because they collide withthe watery molecules and are pushed this way and that.Molecules move so rapidly that within a tenth of a second themolecules round a bacteria have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to achanging environment.我们并不主张考生死记范文，考试时如果遇到类似题目照搬上去，这并不能考察考生的写作能力。新托福考试写作多背一些范文，可以