C．the difference between the earth and the moon

　　D．Li Yanping, my friend, who is an astronaut

　　答案：1～5　ABDAB

　　Ⅰ.单词拼写

　　1．A truck went out of control and crashed (碰撞) into the back of a bus.

　　2．The young man knows little about Newton's law of gravity (万有引力).

　　3．The smell of new bread floated (飘动) up from the kitchen.

　　4．Don't pull (拉) so hard or the handle will go off.

　　5．Britain has a temperate climate (气候)．

　　6．Eggs are sold by weight (重量)．

　　Ⅱ.拓展词汇

　　1．biology n．生物学→biologist n．生物学家

　　2．gentle adj.温和的；文雅的→gently adv.温和地

　　3．physicist n．物理学家→physics n．物理学→physical adj.物理的；物理学的；体力的

　　4．extinct adj.灭绝的；绝种的→extinction n．灭绝；绝种

　　5．weightlessly adv.失重地→weightless adj.失重的

　　[巧记单词]

派生词 biologist →biology＋去y＋­ist gently →gentle＋去e＋­y physicist →physics＋去s＋­ist 　　Ⅲ.补全短语

　　1．block out　　　挡住(光线)

　　2．break out 突发；爆发

　　3．cheer up 感到高兴；感到振奋

　　4．now that 既然

　　5．watch out (for) 密切注视；当心；提防

　　6．get the hang of 熟悉；掌握；理解

1．[教材原句]When we get closer to the moon, we shall feel its gravity pulling us, but it will