TOEFL ITP Practice Questions - TOEFL ITP Assessment Series Exam

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Listening transcript: Professor: Today's lecture considers why some desert plants open their pores mainly at night. By doing so, they take in carbon dioxide while losing less water than they would during the hotter daytime hours. What is the lecture mainly about?

How certain plants conserve water in dry environments Why desert soil contains very little carbon dioxide Methods for measuring rainfall in tropical forests The history of agriculture in ancient river valleys

Correct Answer:

How certain plants conserve water in dry environments

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