The Evolving Virus
Viruses are often confused with bacteria, but they are __________1.(difference) – much smaller and __________ 2.(difficult) to treat. They “live” inside of our cells though, really, viruses aren’t living or dead. Each tiny virus __________3.(hold) instructions for how and when to create new viruses. They need a host to replicate. Once they get inside one of our __________4.(cell), they hijack or mislead the system and tell the cell __________5.(start) making more viruses to dreadful conditions or even death. ______(6) virus will attach itself to the outside of a cell and inject the information into the cell. Our cells protect these viruses __________7. attack once the virus enters the cell. That’s why viruses are difficult _______ 8.(treat). The body can fight many __________9.(virus) on its own, but not always. The deadly COVID-19 strain of coronavirus has so far been ________(10)(poor) understood by the __________11.(science) community since it is still evolving into something much worse and difficult to treat.
参考答案：
1. different
2. more difficult
3. holds
4. cells
5. to start
6. The
7. from
8. to treat
9. viruses
10. poorly
11. scientific
命题重点：
The Evolving Virus
Viruses are often confused with bacteria, but they are different – much smaller and more difficult to treat. They “live” inside of our cells though, really, viruses aren’t living or dead. Each tiny virus holds instructions for how and when to create new viruses. They need a host to replicate. Once they get inside one of our cells, they hijack or mislead the system and tell the cell to start making more viruses to dreadful conditions or even death. The virus will attach itself to the outside of a cell and inject the information into the cell. Our cells protect these viruses from attack once the virus enters the cell. That’s why viruses are difficult to treat. The body can fight many viruses on its own, but not always. The deadly COVID-19 strain of coronavirus has so far been poorly understood by the scientific community since it is still evolving into something much worse and difficult to treat.
原文再现：
The Evolving Virus
Viruses are often confused with bacteria, but they are different – much smaller and more difficult to treat. They “live” inside of our cells though, really, viruses aren’t living or dead. Each tiny virus holds instructions for how and when to create new viruses. They need a host to replicate. Once they get inside one of our cells, they hijack or mislead the system and tell the cell to start making more viruses to dreadful conditions or even death. The virus will attach itself to the outside of a cell and inject the information into the cell. Our cells protect these viruses from attack once the virus enters the cell. That’s why viruses are difficult to treat. The body can fight many viruses on its own, but not always. The deadly COVID-19 strain of coronavirus has so far been poorly understood by the scientific community since it is still evolving into something much worse and difficult to treat.
参考译文：
进化中的病毒
人们常把病毒和细菌弄混，其实二者是有区别的——病毒与细菌相比要小得多，而且更难对付。病毒可以在人体细胞内“存活”，不过，事实上它们既不是生命体也不是非生命体。每一个微小的病毒都携带怎样以及何时产生新病毒的指令。它们需要宿主才能完成自身复制。一旦进入人体细胞，它们便会劫持或误导细胞的生长机制，让细胞制造更多病毒，致使细胞严重受损甚至死亡。病毒会附着在人体细胞表面，并向其注入自己的遗传信息。一旦病毒侵入人体细胞，细胞便会保护病毒免受攻击。为什么病毒难以对付？原因就在于此。人体靠自身可以对抗许多种病毒，但情况并非总是如此。科学界对新型冠状病毒认知尚浅，因为病毒仍在朝更强、更难对付的方向进化。
