English Language · English
Which choice completes the text with the most logical and precise word or phrase? Researchers have struggled to pinpoint specific causes for hiccups, which happen when a person's diaphragm contracts ______blank. However, neuroscientist Kimberley Whitehead has found that these uncontrollable contractions may play an important role in helping infants regulate their breathing.
- 1smoothly
- 2strenuously
- 3beneficially
- 4involuntarily✓
Correct answer
involuntarily
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