托福写作|TPO39【综合+独立】写作范文+题目-上海新航道官网

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托福写作|TPO39【综合+独立】写作范文+题目

2017/4/27 15:32:34来源：新航道作者：新航道

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摘要：在托福写作练习过程中，相信TPO材料中的作文题目都会是大家的首选练习材料。今天，上海新航道托福小编给考生们带来了托福TPO39综合写作+独立写作，希望可以帮助广大托福考生轻松备考托福。

在托福写作练习过程中，相信TPO材料中的作文题目都会是大家的首选练习材料。今天，上海新航道托福小编给考生们带来了托福TPO39综合写作+独立写作，希望可以帮助广大托福考生轻松备考托福。

TPO39综合写作

The continent of Antarctica, centered on Earth’s South Pole, is one of the world’s coldest areas, supporting a very limited range of plants and animals. Some scientists believe, however, that around 15 million years ago, during the geologic period called the Middle Miocene, Antarctica was as much as 11C warmer than it is today, and it supported much richer ecosystems, including much more diverse plant life. They have several arguments to support that claim.

Pollen Grains

First, there is the evidence of pollen grains, small particles that plants release when they reproduce. Pollen grains from two types of trees dating to 15 million years ago have been found on the coast of Antarctica. Trees typically require much higher temperatures than the plants that currently grow in Antarctica. The presence of trees indicates that the plant life in Antarctica was much richer during the Middle Miocene, and that the temperature in Antarctica was therefore much higher than it is today.

Carbon Dioxide

There is also some indication that carbon dioxide (CO2) levels in the atmosphere were elevated during the Middle Miocene. Carbon dioxide is linked to climate warming because it traps heat. An important source of CO2 is volcanic activity. There were major volcanic eruptions during the Miocene. That suggests that atmospheric CO2 levels were higher than they are today, which would have contributed to the warming of the Antarctic climate.

Deuterium and Increased Rainfall

Third, high levels of deuterium have been found in the remains of plants that grew in Antarctica 15 million years ago. Deuterium is a chemical element present in rainwater. Since plants absorb deuterium when it rains, the amount of deuterium in a plant usually indicates the amount of rainfall: high levels of deuterium in the Antarctic plants from the Middle Miocene indicate high amounts of rainfall. High amounts of rainfall are often caused by increased temperatures.

TPO39独立写作

Do you agree or disagree with the following statement:

Many people nowadays spend too much money on their pets (dogs, cats, or other animals), although there are better uses for this money.

Use specific reasons and examples to support your answer.

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