题目内容

16.The__________of this machine is simple.

A. operating
B. replace
C. protein
D. operation

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17.The gas explosion was really__________.

A. frightened
B. frightening
C. fright
D. fighting

18.Edison__________the electric bulbs over one hundred years ago.

A. found
B. discovered
C. thought
D. invented

19.Taste and__________are closely connected.

A. smell
B. legs
C. mouth
D. hearing

20.At first you must__________yourself, and then you can comfort others.

A. control
B. limit
C. restrict
D. confine