A) is able to design new tools
B) measures the amount of energy used
C) enable people to see the muscular movements
D) visualizes electrical signals
24. It can be inferred from the passage that ________________.
A) a stepladder used to have four legs.
B)it is dangerous to use tools
C) a tripod is safer in a tool design
D) workers are safer on production lines
25. Dr. Tichauer started his experiments initially to _________________.
A) improve efficiency
B)increase production
C) reduce work load
D) improve comfort
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