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New TOEFL IBT Pratice Test #004
New TOEFL IBT Pratice Test #004
Listening | Question 18 of 18
Listen to an Academic Talk
Why does the professor mention the whole plant community?
A) To show that the signal has a wide-ranging effect
B) To explain that only certain plants can communicate
C) To argue that this defense is not very effective
D) To give an example of competition among plants