32．Which of the following is supported by the “Limitations Theory”？

　　A．Tiredness is caused by signals from brain.

　　B．The body uses 100% of the muscle fibers in exercise.

　　C．Athletes feel tired when they use up all their energy.

　　D．Athletes become tired though lactic acid levels remain low.

　　答案：C　细节理解题。由第一段最后一句话“In other words, muscles tire because they hit a physical limit: they either run out of

　　fuel or oxygen or they drown in harmful by­products(副产品)．”可知。

　　33．Noakes has found out that ________.

　　A．muscle fibers control athletes' movements

　　B．mental processes control the symptoms of tiredness

　　C．lactic acid levels remain high in cycling test

　　D．different exercises use different amount of muscle fibers

　　答案：B　细节理解题。由第二段第三句话“The fundamental nature of his new theory is that the brain paces the muscles to keep them well back from the edge of exhaustion.”可知。

　　34．It is likely that both theories accept that ________.

　　A．the energy in human bodies can be balanced

　　B．the oxygen content in blood may rise after sports

　　C．tiredness is a harmful by­product of exercise

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