Every electronic gadget (小玩意) needs good memory. A music player stores songs, albums and playlists. A computer holds schoolwork and programs and remembers how far a player has advanced in his or her favorite game. Mobile phones store names, numbers and hundreds of texts.

Now, scientists in California say they have come up with a way to turn a living cell into a memory device.

It can store only one tiny bit of information, but it’s a start. In the future, a cell-based gadget might travel through the body and record measurements. The benefit to human health could be big: the right tool, for example, might record the earliest signs of disease.

Doctors, scientists and other curious people want to know what is happening inside the body, even at levels that can’t be seen by the naked eye. So far, there is no device small enough to travel through the bloodstream.

If normal machines won’t do the trick, perhaps biology will. Scientists who work in the field of synthetic (合成的) biology are trying to find ways to turn living things into human tools. In the case of the new memory device, bioengineers from Stanford University used the genetic material inside living cells to record information.

This genetic material consists of DNA. Found in nearly every cell, DNA carries all of the information that keeps a living thing alive.

In the new experiment, the researchers turned DNA from bacteria(细菌) into a switch. They “flip (翻转)” a small section of DNA. Then, using the same procedure (过程) , the scientists flip the section again—returning it into its normal structure.

Using these DNA switches, “We can write and erase DNA in a living cell,” bioengineer, Jerome Bonnet, explained to Science News.

It might take years before his team or others identity whether a DNA-based memory device might be practical. Right now, it takes one hour to complete a flip. That is far too long to be useful. Plus, a flipped section has a very small little memory—less than what a computer uses to remember a single letter.

 “This was an important proof that it was doable,” Bonnet told Science News. “Now we want to build a more complex system, something that other people can use.”

1.What is the aim of listing the electronic things in the first paragraph?

A. To make the passage more fashionable.

B. To show how electronic things have memory.

C. To discuss things in detail.

D. To make the subject of the text more understandable.

2.What is possible future benefit of the cell-based gadget for people?

A. To detect disease at the earliest point.

B. To help improve the memory.

C. To help people build a body.

D. To replace many electronic gadgets.

3.What is the object being researched?

A. The cells of bacteria.               

B. The DNA of bacteria.

C. A section of bacteria.              

C. The nucleus of bacteria.

4.What do we know about a flipped section of DNA?

A. It has a very small memory.

B. It can function as a computer.

C. It has one letter in it.   

D. It takes a day to complete it.

Where on Earth are you? Navigators (导航员) use lines of latitude and lines of longitude to locate places. Lines of latitude run east and west around Earth. On a map or globe, these lines appear as running sideways or horizontally. Lines of longitude run north and south around Earth. These lines go up and down or vertically on a map or globe. These lines create an imaginary graph paper on the Earth. They make it possible to find an absolute, or exact, location on Earth. They even allow us to give an absolute location to a place out in the middle of the ocean.

Lines of latitude tell us how far north or south of the Equator we are. Sailors have used primitive navigation tools, like astrolabes, since ancient times. The astrolabe uses the sun and stars to find an approximate location. Using such tools, they have been able to approximate their distance from the equator. Although their instruments may not have been the high quality we have now, they were incredibly accurate (精确) for their time.

Lines of longitude tell us how far east or west of the prime meridian (本初子午线) we are. Sailors constantly looked for new ways to increase their navigation skills. Still, it wasn’t until the 18th century that they were able to measure degrees of longitude. They would have been very envious of the technology available to us today.

When we use lines of latitude and longitude together, we can get a very precise location. If we want to identify the absolute location of a point, we look where the latitude and longitude lines cross nearest to that point. We use the coordinates (坐标) for that point as its address. Many maps today include degrees of latitude and longitude.

1.______ make it possible for people to find an exact place on Earth.

A．Latitudes          B．Longitudes         C．Navigators         D．Sailors

2.The second paragraph mainly talks about _______.

A．the function of latitude                   B．the use of the equator

C．the invention of astrolabe                 D．the high quality instruments

3. Why do maps include degrees of latitude and longitude?

A．To help trade expeditions.                 B．To locate a precise place.

C．To cross the lines of the nearest point.       D．To identify how far a place is.

4.The best title for this passage is ____________.

A．The map and the globe                   B．Latitude and longitude

C．The equator and the prime meridian         D．Absolute coordinates

Where on Earth are you? Navigators (导航员) use lines of latitude and lines of longitude to locate places. Lines of latitude run east and west around Earth. On a map or globe, these lines appear as running sideways or horizontally. Lines of longitude run north and south around Earth. These lines go up and down or vertically on a map or globe. These lines create an imaginary graph paper on the Earth. They make it possible to find an absolute, or exact, location on Earth. They even allow us to give an absolute location to a place out in the middle of the ocean.
Lines of latitude tell us how far north or south of the Equator we are. Sailors have used primitive navigation tools, like astrolabes, since ancient times. The astrolabe uses the sun and stars to find an approximate location. Using such tools, they have been able to approximate their distance from the equator. Although their instruments may not have been the high quality we have now, they were incredibly accurate (精确) for their time.
Lines of longitude tell us how far east or west of the prime meridian (本初子午线) we are. Sailors constantly looked for new ways to increase their navigation skills. Still, it wasn’t until the 18th century that they were able to measure degrees of longitude. They would have been very envious of the technology available to us today.
When we use lines of latitude and longitude together, we can get a very precise location. If we want to identify the absolute location of a point, we look where the latitude and longitude lines cross nearest to that point. We use the coordinates (坐标) for that point as its address. Many maps today include degrees of latitude and longitude.
【小题1】______ make it possible for people to find an exact place on Earth.

The law has a great many rules, showing when and how far a man is to be punished, or if he should be made to hand over money or property to his neighbors, and so on. These rules are contained in books. A lawyer learns them mainly by reading books.
He begins by doing little else than reading, and after he has prepared himself by three years’ study, still, he has to, almost every day, read more about some new questions which he has to answer.
The power to use books, then, is a special skill which a would-be lawyer ought to possess. He ought to have enough flexibility（灵活性）to make it easy for him to collect ideas from printed words. He ought to have some readiness to find what a book contains, and something of an instinct（直觉）for where to look for what he wants.
But although this is the power which he will first feel in need of, it is not the most important. A lawyer does not study law to recite it; he studies it to use it and act upon the rules which he has learned in real life. His business is to try cases in court and to advise people what to do in order to keep out or get out of trouble.
【小题1】The first thing a law student has to do is to _______.

The law is a great mass of rules, showing when and how far a man is possible to be punished, or to be made to hand over money or property to his neighbors, and so on. These rules are contained in books. A lawyer learns them mainly by reading books.

 He begins by doing nothing but read, and after he has prepared himself by three years study practice, still, all his life long and almost every day, he will be looking into books to read a little more than he already knows about some new questions which he has to answer.

    The power to use books, then is a special skill which the would - be lawyer ought to possess. He ought to have enough flexibility（灵活性）to make it easy for him to collect ideas from printed words. He ought to have no difficulty in finding what a book contains, and something of an instinct（直觉）for where to look for what he wants.

 But although this is the power of which he will first feel the need, it is not the most important. A lawyer does not study law to recite it; he studies it to use it and act upon the rules which he has learned in real life. His business is to try cases in court and to advise men what to do in order to keep out or get out of trouble.

1. After three years of reading________.

 A. he can study law                  B. he can stop reading

 C. he still has to continue reading  D. he is able to give clever answers

2. The major business of a lawyer is________.

 A. to discuss the material he has read 　　B. to advise people who have law problems

 C. to learn about real life              　D. to study the law

3. According to the passage, a good lawyer should know how to________.

 A. understand and use what he reads    B. be convenient in everything

 C. collect ideas from different source D. use power in the court