听力

between these two epics. Now there is growing evidence that the presence of humans has altered the earth so much that a new epic of geologic history has began – the Anthropocene epic, a new

el predicts. But this would mean that it had lost mass over the course of four billion years. Student Is that possible? Professor Actually, the Sun is constantly losing mass through the solar wind, a

h reflection going at all. At the same time, these clouds trap in some of Earth39。 s heat. Because of the trapped heat, these clouds have an overall heating effect. Student: Oh. OK. Since low thick

ve to study, so you get your results faster. So I‘ll predict that UraniumLead Dating is going to bee an increasingly popular dating method. There are a few pretty exciting possibilities for

7 Trees can also help break the force of the winds. The reason that high buildings may keep windier at ground level is that as the wind goes higher and higher, it goes faster and faster. When the

r of their college grades, than were their SAT scores or their grade point averages in high school, the two measures most monly used to predict college performance. ‘Students with high hope set

erature increase has occurred during the winter and spring, not during the summer. Butthe increase in shrubs has occurred in the how can increase temperaturesin thewinter and spring result in

ton 质子 molecule 分 子 particle 粒子 ion 离子 particle accelerator 粒子加速器 catalysis （复数 catalyses） 催化作用 catalyst 催化剂 artificial 人造的 synthetic 合成的 synthetic fiber 人造纤维 polymer 聚合物 polymerization 聚合作用 plastic

ektion 25 Lektion 26。

fforts in several states to reduce the negotiating rights of public employees. People in a munity on the Pacific coast in Southern California awoke last week to a sea of dead fish. Estimates put the