The doctor uses a _______ to listen to a patient's heartbeat.
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Worked Solution
Step 1: Identify the context. The sentence mentions a doctor and listening to a heartbeat.
Step 2: Recall which tool doctors use to listen to the heart and lungs. This is a stethoscope.
Step 3: Check the other options — telescope, microscope, and periscope are all "scopes" used for seeing, not for listening.
Answer: stethoscope
Correct answer: stethoscope
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