A．matterB．happenC．marryD．wander
A. matter
B. happen
C. marry
D. wander
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What is John Harrison' s job？
An official.
B. An ice-cream taster.
C. A chemist.
D. An ice-cream manufacturer,
A．At firstB．FirstC．OneD．At the beginning
At first
B. First
C. One
D. At the beginning
A．patientlyB．proudlyC．silentlyD．tiredly
A. patiently
B. proudly
C. silently
D. tiredly
The author mentions Harlow' s experiment to show that______.
A. adults should develop social skills
B. babies need warm physical contact
C. caregivers should be healthy adults
D. monkeys have social relationships
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