Bruce always ______ his teeth at 6:15 every morning.
A.brush B.brushes C.is brushing D.are brushing
Lily can’t go out for dinner ______ school nights.
A.on B.in C.to D.at
Lucy is good at playing ______ violin and she wants to join the music club.
A.a B.the C.an D./
Miss Yang teaches ______ English this year.
A.we B.us C.our D.ours
这是一幅来自CCTV1节目中的图片。请仔细观察这幅图并进行描述。预设下一秒可能会发生的几种情况及其结果。阐述一条图片隐含的寓意，并提出人与自然如何相处的建议（至少2条），完成一篇面向全校师生的英语演讲稿。
要求：
1、演讲稿中不能出现任何个人和学校的信息。
2、词数100词左右。首尾句已经给出，不计入总词数。
3、演讲稿必须包含以上图片和文字的所有内容。
4、参考词汇：balance n. v. 均衡，平衡。
Good morning, everyone!
Thank you for coming to this speech. It's my great honor to stand here and communicate with you. First of all, I'd like to show you a picture from a TV program of CCTV 1._______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Thank you so much again and hope you enjoy it!
Do you know viruses (病毒) and bacteria (细菌)? Both of them are very small, we can't see them with our eyes, and many people know nothing about them, In fact, there are a number of differences between viruses and bacteria. Bacterium, the singular form of the word bacteria, is a one-celled (单细胞) living thing, with complete sets of both RNA and DNA genetic codes (遗传密码). For viruses, some are sections of RNA, and the others are sections of DNA. So, bacterium is at least a hundred times larger than a typical virus.
One main difference between viruses and bacteria is the method of reproduction. A bacterium is a completely independent and self-reproducing unit. When the time is right, bacterium will divide its DNA and RNA genetic material in two. This is how bacteria live in almost every environment on Earth, including non-living things like rocks or plastic.
A virus, on the other hand, cannot reproduce without a living host. A virus may lie for thousands of years before finally coming into a suitable host. Once it enters the body of a host, a virus will get in the ling cell. Once inside a living cell, a virus takes the place of the living cell's DNA or RNA genetic instructions with its own. Those instructions are usually to make as many copies of the virus as possible.
Ninety-nine percent of all known bacteria are considered useful to humans, or at least have no bad influence. But most viruses, on the other hand, serve no good purpose. Their only purpose is to create more viruses in order to make themselves continue to live.
Bacteria are alive, which means they can be killed by some form of chemical things. Antibiotics (抗生素) can kill bacteria. Viruses, by comparison, are not considered living things. They cannot be 'killed' in the same way as antibiotics kill bacteria. In fact, any medicine is useless for virus' infections. The disease must run its course until the body can make a successful protection on its own.
Viruses and Bacteria | |||
Similarity | Both are too small 1. with our eyes. | ||
Differences |
| Viruses | Bacteria |
What they're like | ● They are not living things. | ● They are living things. | |
● A virus is a section of 2. RNA 3. DNA. | ● A bacterium has complete sets of both RNA and DNA genetic codes. | ||
● A virus is much smaller than a bacterium. | |||
How they reproduce | A virus can not copy without a living host | A bacterium can reproduce 4. in almost every environment on Earth. | |
How they influence humans | Most of them do 5.humans. | Most of them are considered useful to humans, or at least have no bad influence. | |
6.for viruses and bacteria | We can use antibiotics to kill bacteria while for viruses it only depends on if our body can make a successful protection on its own. |
