（ ） we continue to work hard, we can finish the task ahead of schedule.

A.As soon as B.As far as C.So long as D.So far as

For centuries, humans have harnessed the power of biological systems to improve their lives and the world. Some argue that biotechnology began thousands of years ago, when crops were first bred for specific traits and microorganisms were used to brew beer. Others define the beginning of biotechnology as the emergence of techniques allowing researchers to precisely manipulate and transfer genes from one organism to another. （1）Genes are made up of DNA and are expressed into proteins, which do chemical work and form structures to give us specific traits. In the 1970s, scientists discovered and used the power of natural “scissors” —proteins called restriction enzymes—to specifically remove a gene from one kind of organism and put it into related or unrelated organisms. Thus, recombinant DNA technology, or what most experts now label as modem biotechnology, was bom.The pioneers of biotechnology could not have envisioned our current abilities to engineer plants to resist disease, animals to produce drugs in their milk, and small particles to target and destroy cancer cells.（2） Genomics is based on these tools and is the study of genes and their functions. We have determined the composition of, or “sequenced”，the entire set of genes for humans and several other organisms using biotechnology. （3）Biotechnology, or really any technology, does not exist in a vacuum. It is derived from human efforts and affected by social, cultural, and political climates. Society drives and regulates technology, attempting to minimize the downsides and maximize the benefits. （4）Recent controversies over the use of genetically engineered organisms in food and agriculture have illustrated that this boundary is not so clear. Not only are there safety concerns about genetically engineered organisms, but there are also cultural differences in acceptance of the products.International contexts for technologies are important and should be considered. （5）On the other hand, there are social systems that are affected by new technologies and fears of creating greater divides between rich and poor if technology is not accessible to all sectors of society.

A.The discovery of the structure of deoxyribonucleic acid (DNA) in the 1950s marks the start of this era. B.Many natural and physical scientists would prefer that the separation between social and ethical concerns and science and technology be well defined. C.Genomic information is helping us better to evaluate the commonalities and diversity among organisms and human beings and to understand and cure disease, even tailoring treatments to individuals. D.There are clear indications that biotechnology can benefit the poor and hungry of the world without harming the environment. E.Biotechnology is not a panacea for global problems, but it is a tool that holds a great deal of promise if used appropriately. F.However, biotechnology is more than engineering—it is also a set of tools for understanding biological systems.
问题2：
A.The discovery of the structure of deoxyribonucleic acid (DNA) in the 1950s marks the start of this era. B.Many natural and physical scientists would prefer that the separation between social and ethical concerns and science and technology be well defined. C.Genomic information is helping us better to evaluate the commonalities and diversity among organisms and human beings and to understand and cure disease, even tailoring treatments to individuals. D.There are clear indications that biotechnology can benefit the poor and hungry of the world without harming the environment. E.Biotechnology is not a panacea for global problems, but it is a tool that holds a great deal of promise if used appropriately. F.However, biotechnology is more than engineering—it is also a set of tools for understanding biological systems.
问题3：
A.The discovery of the structure of deoxyribonucleic acid (DNA) in the 1950s marks the start of this era. B.Many natural and physical scientists would prefer that the separation between social and ethical concerns and science and technology be well defined. C.Genomic

If you are catching a train, it is always （ ）better to be early even a fraction of a minute than too late.

A.far more B.even more C.enough more D.more far

s="" dance="" instructor,="" thought="" she="" has="" a="" stomach="" virus.="" the="" aches="" and="" cramping="" were="" tolerable="" that="" first="" day,="" finished="" her="" classes.="" then="" diarrhea="" turned="" bloody.="" kidneys="" shut="" down.="" seizures="" knocked="" unconscious.="" convulsions="" grew="" so="" relentless="" doctors="" had="" to="" put="" in="" coma="" for="" nine="" weeks.="" when="" emerged,="" could="" no="" longer="" walk.="" affliction="" ravaged="" nervous="" system="" left="" paralyzed="" from="" waist="" down.Ms. Smith was found to have a severe form of food-borne illness causes by E. coli, which Minnesota officials traced to the hamburger that her mother had grilled for their Sunday family party. In the simplest terms, she ran out of luck in a food-safety game of chance whose rules and risks are not widely known.Meat companies and grocers have been barred from selling ground beef tainted by the virulent strain of E. coli known as O157: H7 since 1994. Yet tens of thousands of people are still sickened annually by this pathogen, with hamburgers being the biggest culprit. Ground beef has been blamed for 16 outbreaks in the last three years alone. This summer, contamination led to the recall of beef from nearly 3 000 grocers in 41 states.Ms. Smith's reaction to the virulent strain of E. coli was extreme, but tracing the story of her burger shows that neither the system meant to make the meat safe, nor the meat itself, is what consumers have been led to believe.Ground beef is usually not simply a chunk of meat run through a grinder. Instead, a single portion of hamburger meat is often an amalgam of various grades of meat from different parts of cows and even from different slaughterhouses. This makes the costs 25% less than it would have for cuts of whole meat. These cuts of meat are particularly vulnerable to E. coli contamination, food experts and officials say. Despite this, there is no federal requirement for grinders to test their ingredients for the pathogen.Those ingredients include cuts from areas of the cow that are more likely to have had contact with feces, which carries E. coli, industry research shows. Yet most meat companies rely on their suppliers to check for the bacteria and do their own testing only after the ingredients are ground together.Unwritten agreements between some companies appear to stand in the way of ingredient testing. Many big slaughterhouses will sell only to grinders who agree not to test their shipments for E. coli for fear of a recall of ingredients they sold to others.“ Ground beef is not a completely safe product," said Dr. Jeffrey Bender, a food safety expert at the University of Minnesota who helped develop systems for tracing E. coli. contamination. He said that while outbreaks had been on the decline, “unfortunately it looks like we are going a bit in the opposite direction. ”1.What is the main idea of this passage?2.We can learn from the passage that （ ）.3.The reason behind the way ground beef produced is （ ）.4.We can infer that many big slaughterhouses （ ）.5.As Bender implies at the end of the passage,（ ）.'>

Stephanie Smith, a children's dance instructor, thought she has a stomach virus. The aches and cramping were tolerable that first day, and she finished her classes. Then her diarrhea turned bloody. Her kidneys shut down. Seizures knocked her unconscious. The convulsions grew so relentless that doctors had to put her in a coma for nine weeks. When she emerged, she could no longer walk. The affliction had ravaged her nervous system and left her paralyzed from the waist down.Ms. Smith was found to have a severe form of food-borne illness causes by E. coli, which Minnesota officials traced to the hamburger that her mother had grilled for their Sunday family party. In the simplest terms, she ran out of luck in a food-safety game of chance whose rules and risks are not widely known.Meat companies and grocers have been barred from selling ground beef tainted by the virulent strain of E. coli known as O157: H7 since 1994. Yet tens of

Many questions about estrogen’s effects remain to be elucidated, and investigations are seeking answers through ongoing laboratory and clinical studies.

A.implicated B.implied C.illuminated D.initiated

Beijing Tourism Bureau has released a list of translations for 2 753 dishes and drinks to （ ）public opinions.

A.solicit B.perceive C.conceive D.investigate