研究生英语课后练习答案

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Unit one

1. In the production of grains, fruits and vegetables, the agronomy research plays a(an) instrumental role.

2. Pest--resistant and stress--tolerant crops can be developed to reduce the risk of crop failure due to drought and disease.

3.Recombinant gene technology is widely employed in research and development for strain improvement.

4. All these brightly colored hybrids are so lovely in the garden.

5. For bacteria, they are binary（二元的）fission（分裂生殖法）and conjugation.

6. Each of them has a counterpart column in the database tables.

7. Plant breeding must be coupled with transgenic improvement to bring economically viable products to the marketplace.

8. Crops are derived from the evolutionary process as all other living creatures, from the wild to the domestic.

9.Backcross breeding is a useful method to transfer favorable alleles from a donor parent into a recipient parent.

10. At the conclusion of the recurrent run, you should gather and evaluate the utilization levels for all four resources crops.

Unit two

1. However, what on earth has evoked four emotions of “Mona Lisa ”

concurrently.

2. A particular perspective is a particular way of thinking about something, especially one that is influenced by your beliefs or experiences.

3. The atmosphere encompasses the Earth.

4. A(An) adjunct professor is also a limited or part--time position to do research or teach classes.

5. Between technical and popular science, writing is what I call “integrative science”, a process that blends data, theory and narrative.

6. He announced that there would be more stringent controls on the possession of weapons.

7. The efficacy of an alarm clock is explained as a very vigorous sensory input that triggers（引起）a large, synchronous（同时）assembly.

8. We have derived a great deal of benefit from her advice.

9. They have one of the only holistic health programs in the country.

10. These discoveries may shed light on the origins of the universe.

Unit four

1. Increased consumption of water has led to rapid depletion of groundwater reserves.

2. There are extreme arid regions where only the fittest survive.

3. Moisture is drawn to the surface of the fabric so that it evaporates.

4. Untrammeled industrialization, particularly in the poor countries, is

contaminating the river and aquifer.

5. The pond is small but can support many aquatic plants and fish.

6. Although all plants normally contain fluorine（氟）, the concentration varies greatly.

7. Your body is in survival mode and needs food to replenish its energy.

8. The disrupted drainage will cause whole hillsides of waterlogged or dried out peat（泥炭）to slide.

9. The products may serve to protect the water tanks, engines and metal pieces, and to prevent encrustation and raise heating rate, more fuel--efficient energy.

10. The erosive rain is defined as rain as rain, which can cause soil erosion.

Unit six

1. As a result, our incessant interaction with food takes on immense power and can define who we are.

2. Finally each year we will voluntarily report to Congress when we have invoked（行使）the privilege because there must be proper oversight of our actions.

3. Animal and vegetable pets propagate with extreme rapidity.

4. Environmental groups say the process can contaminate drinking--water supplies, a charge the industry denies.