【备考必备】托福官方真题Official22阅读长难句资料汇总

2016年01月21日15:47 来源：互联网: 参与（3）阅读（8154）

摘要：托福官方真题Official是考生备考托福最常用的资料，对于一些托福阅读考试中常见的长难句，也是困扰考生最大的问题。那么这些长难句应该如何去应对呢？这里为大家整理了官方真题Official阅读长难句的汇总，希望对大家的托福阅读长难句备考有帮助。

在这里小编为大家带来托福官方真题Official22阅读长难句，希望对大家提高托福阅读水平有所帮助!

托福官方真题Official22阅读长难句官方真题Official22: Spartina

1. As the seaweed and marsh grass leaves die, bacteria break down the plant material, and　insects, small shrimplike organisms, fiddler crabs, and marsh snails eat the decaying　plant tissue, digest it, and excrete wastes high in nutrients.

2. It spreads primarily by underground stems; colonies form when pieces of the root　system or whole plants float into an area and take root or when seeds float into a suitable　area and germinate.

3. Once established, a stand of Spartina begins to trap sediment, changing the substrate　elevation, and eventually the stand evolves into a high marsh system where Spartina is　gradually displaced by higher-elevation, brackish-water species.

4. Leaving its insect predators behind, the cordgrass has been spreading slowly and　steadily along Washington’s tidal estuaries on the west coast, crowding out the native　plants and drastically altering the landscape by trapping sediment.

5. Efforts to control Spartina outside its natural environment have included burning,　　flooding, shading plants with black canvas or plastic, smothering the plants with dredged　materials or clay, applying herbicide, and mowing repeatedly.

6. Even with a massive effort, it is doubtful that complete eradication of Spartina from　nonnative habitats is possible, for it has become an integral part of these shorelines and　estuaries during the last 100 to 200 years.

官方真题Official22: The Birth of Photography

1. The images produced by the camera obscura, a boxlike device that used a pinhole or　　lens to throw an image onto a ground-glass screen or a piece of white paper, were already　familiar—the device had been much employed by topographical artists like the Italian　painter Canaletto in his detailed views of the city of Venice.

2. Because the medium was so prolific, in the sense that it was possible to produce amultitude of images very cheaply, it was soon treated as the poor relation of fine art,　　rather than its destined successor.

3. The rapid technical development of photography—the introduction of lighter and　　simpler equipment, and of new emulsions that coated photographic plates, film, and　　paper and enabled images to be made at much faster speeds—had some unanticipated　consequences.

4. The new candid photography—unposed pictures that were made when the subjects　were unaware that their pictures were being taken—confirmed these scientific results,　　and at the same time, thanks to the radical cropping (trimming) of images that the　camera often imposed, suggested new compositional formats.

托福官方真题Official22阅读长难句官方真题Official22: The Allende Meteorite

1. Sometime after midnight on February 8,1969, a large, bright meteor entered Earth's　　atmosphere and broke into thousands of pieces, plummeted to the ground, and scattered　over an area 50 miles long and 10 miles wide in the state of Chihuahua in Mexico.

2. When broken open, Allende stones are revealed to contain an assortment of small,　　distinctive objects, spherical or irregular in shape and embedded in a dark gray matrix　(binding material), which were once constituents of the solar nebula—the interstellar　　cloud of gas and dust out of which our solar system was formed.

3. A few chondrules contain grains that survived the melting event, so these enigmatic　　chondrules must have formed when compact masses of nebular dust were fused at high　temperatures—approaching 1,700 degrees Celsius—and then cooled before these　surviving grains could melt.

4. However, studies of the textures of inclusions reveal that the order in which the　　minerals appeared in the inclusions varies from inclusion to inclusion, and often does not　match the theoretical condensation sequence for those metals.

5. However, detailed studies of the chondrite matrix suggest that much of it, too, has been　formed by condensation or melting in the nebula, although minute amounts of surviving　　interstellar dust are mixed with the processed materials.

6. Since practically all the solar system's mass resides in the Sun, this similarity in　chemistry means that chondrites have average solar system composition, except for the　most volatile elements; they are truly lumps of nebular matter, probably similar incomposition to the matter from which planets were assembled.

以上就是小编为大家整理的官方真题Official22阅读长难句，希望对大家托福阅读备考有帮助。最后小编预祝大家托福考试能取得理想的成绩。