I. 回首教材：
（一）Why are cellphones so popular, (尤其在青少年当中)？The answer seems to be that (我们有必要与朋友和家人保持联系，不管我们在哪里或在做什么) . (拥有手机也能让我们感到更安全，) since we cancall for help(在紧急情况下) . Cellphones, or mobile phones, (让我们同任何地方的任何人交谈成为了可能). Words and images are being sent throughout the world.
(现代手机不仅仅是电话)， ____________________
(它们被用作相机和收音机，用来发邮件和上网。)
(手机已经改变了我们的行为和交流的方式) They are being used everywhere---sometimes where they shouldn't. If a phone starts ringing in the classroom, teacher and students (会受到打扰)and can not work. Some parents (担心他们的孩子们将会花太多时间和金钱在手机上面) .
（二）Steve Jones is an environmental expert (尽力保护动植物不受危害)
He said, (没有动植物在身边我们人类就不能生存)
.(如果我们想过较好的生活和有光明的将来)， we must learn to act in (对其它生物无害的方式) . If we know more about what causes endangerment, we may be able to (及时采取措施)
A species can become endangered (由于各种不同的原因) . The good news is (我们还有很多能够做的)。First of all, (我们需要了解更多关于动物，植物和环境) ,Secondly, we need to think about what we can do to keep animals and plants from becoming endangered. Finally, we can help
(通过为动植物创造更多的空间)。
