单项选择题

A "myograph" (Para. 2, Line 1) is an electronic instrument that __________.

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
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单项选择题
According to the author, if your letter is thrown into some letters-to-be-read file,
A．it will receiver immediate attention
B．it will be dealt with by the secretary
C．it is likely to be neglected
D．it is meant to be delivered soon
单项选择题
The purpose of the author in writing this passage is __________.
A．to explain and persuade
B．to comment and criticize
C．to interest and entertain
D．to argue and demonstrate
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