Go over Part 3. This part will tell us that each body paragraph usually contains a topic sentences and a concluding sentence to the paragraph. Try to find what the topic sentence should be like and where it can be found, what supporting sentences are, and what the function of a concluding sentence is in a paragraph.
Read Part 4 and try to find how the concluding paragraph functions in a text.
Task 3: Do the exercise on page 41. Read the sentences and decide which paragraph they belong to and what type of sentence each one is.
巩固拓展【能力升华提一提】
Read the following passage and do the exercises as you are required to.
Are There Extra-Terrestrials?
(1) Many scientists today believe that life exists elsewhere in the universe—life probably much like that on our own planet. They reason in the following way.
(2) As far as astronomers can determine, the entire universe is built of the same matter. They have no reason to doubt that matter obeys the same laws in every part of the universe. Therefore, it is reasonable to guess that other stars, with their own planets, were born in same way as our own solar system. What we know of life on earth suggests that life will arise wherever the proper conditions exist.
(3) Life requires the right amount and kind of atmosphere. This eliminates all those planets in the universe that are not about the same size and weight as the earth. A smaller planet would lose its atmosphere; a larger one would hold too much of it.
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