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TOEFL EXAM ESSENTIALS
d. When the immune system breaks down, it can be dev-
astating.
Choice
c is correct—it gives the main idea or point that the
instructor is trying to express. It’s a general statement that
holds together all of the information in the passage. Choice
a is too specific to be the main idea. Choice
b is too general
to be the main idea. Choice
d may be true, but the passage
does not give this information.
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