Toefl exam Essentials

Question: What is the instructor’s main point?
a. The immune system has its own system of checks and
balances.
b. The immune system protects the body.
c. The immune system is a remarkable and complex
communications network.
Main topic: what the conversation or lecture is about
Main idea: what the speaker wants to express about his or
her topic

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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.