单项选择题

From the passage we know that joints and muscles perform best when______.

A．they are twisted and stretched
B．they are in their normal position
C．they are tested with a human" guinea pig"
D．they are tested with electronic instruments

<上一题目录下一题>

热门试题

单项选择题

To parents who take the responsibility for children's expenses, the cost of living increases because______.

A．children attend school for more years
B．children are better dressed
C．children spend more money on entertainment
D．all the above

单项选择题

A myograph (Para. 2, Line 1) is an electronic instrument that______.

A．is able to design new tools
B．measure the amount of energy used
C．enables people to see the muscular movements
D．visualizes electrical signals