1A . I attended the lecture . 1B . I did attend the lecture .
2A . You’ve gotten very good at painting, haven’t you? 2B . You have gotten very good at painting, haven’t you?
3a . She’d been to the capitol before . 3b. She had been to the capitol before.
4a. That’s a difficult problem. 4b. That is a difficult problem.
5a . They understand they can’t miss the exam . 5b. They do understand they can’t miss the exam.
Activity 7.4: Word Stress—Biology Lecture Listening for word stress can help you understand what a speaker means.
Directions: • Listen to the lecture and take notes . Scan the QR code to listen to the audio track . • Listen to the questions and use your notes to answer them . Scan the QR code to listen to the audio track . • Check your answers using the answer key at the end of this section . 1 . Why does the professor discuss the exploration of hydrothermal vents? A. To show how the exploration helped researchers to determine the composition of ocean water B. To show how the exploration challenged an assumption about biological communities C. To compare two competing theories concerning chemosynthesis D. To compare the life cycle of underwater plants to the life cycle of underwater animals 2 . What are three of the conditions of water near hydrothermal vents that made researchers think they would not find living organisms there? Select 3 answers. A. Extreme heat B. Extreme pressure C. Fast currents
D. Lack of minerals E. Lack of sunlight
3 . What does the professor imply about the researchers’ reaction to the biological community discovered on the ocean floor? A . They were surprised at the large variety of organisms living near hydrothermal vents . B . They were surprised to find any bacteria living without sunlight . C. They were disappointed at not finding any animal life. D. They could not agree on the significance of the data that they collected.
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