北师大版英语九年级unit8discoverieslesson22famousdiscoveries第一课时课件内容摘要：
from our parents from it. A B C 1st reading: Read and find the name of the picture A,B and C and make sure whether your match is right or not. Xray DNA antibiotics The first antibiotic: Penicillin 青霉素，盘尼西林 It can wipe out the infection消除感染 Alexander Fleming亚历山大 弗莱明 Event Year The structure of DNA was discovered. Wilhelm Roentgen received the Nobel Prize. Scientists discovered DNA. 1953 3 When did these things happen? Write the correct years. 1901 1869 2nd reading DNA structure double coiled spiral structure (双线圈螺旋结构） Crick Watson 克里克 沃森 Wilhelm Roentgen Xray 18451923Germany 威廉 伦琴 What effect do these discoveries have? discoveries effect Antibiotics DNA Xrays A lot of diseases can be cured easily with it. pass on certain characteristics, be able to treat more disease. Doctors treat broken bones easily with Xrays machines. 3rd reading Three discoveries DNA (Crick amp。 Watson) Xrays (Wilhelm Roentgen) 1. the building block of life 2. pass on certain characteristics 3. be able to treat more disease Doctors treat brok。阅读剩余 0%
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