tailieunhanh - Sat - MC Grawhill part 20

Beginning in 2005, the new SAT I is more demanding than ever, and can no longer be aced with a few simplistic test-taking tricks. Huge score breakthroughs on the SAT I come only through building your core academic reasoning skills: you have to learn how to solve tough math problems, to read well, and to write well. Good colleges demand these skills, and have persuaded the ETS to re-write the SAT I accordingly. The College Hill Method, which we have incorporated into MCGRAW-HILL'S SAT I, is a remarkably effective system for building the reasoning skills at the core of the. | 180 McGRAW-HILL S SAT SAT Practice 3 Finding Patterns in the Structure of the Passage The following passage from a text ơn the principles of zoology discusses theories of biogenesis the process by which life forms are created. From ancient times people commonly believed that life arose repeatedly by sponta-Line neous generation from nonliving material in addition to parental reproduction. For exam- 5 ple frogs appeared to arise from damp earth mice from putrefied matter insects from dew and maggots from decaying meat. Warmth moisture sunlight and even starlight often were mentioned as factors that 10 encouraged spontaneous generation of living organisms. Among the accounts of early efforts to synthesize organisms in the laboratory is a recipe for making mice given by the Belgian plant 15 nutritionist Jean Baptiste van Helmont 1648 . If you press a piece of underwear soiled with sweat together with some wheat in an open jar after about 21 days the odor changes and the the 20 wheat into mice. But what is more remarkable is that the mice which came out of the wheat and underwear were not small mice not even miniature adults or aborted mice but adult mice emerge 25 In 1861 the great French scientist Louis Pasteur convinced scientists that living organisms cannot arise spontaneously from nonliving matter. In his famous experiments Pasteur introduced fermentable 30 material into a flask with a long s-shaped neck that was open to air. The flask and its contents were then boiled for a long time to kill any microorganisms that might be present. Afterward the flask was cooled and left 35 undisturbed. No fermentation occurred because all organisms that entered the open end were deposited in the neck and did not reach the fermentable material. When the neck of the flask was removed micro- 40 organisms in the air promptly entered the fermentable material and proliferated. Pasteur concluded that life could not originate in the absence of previously existing .