D．the contribution of H．G．Wells

　　29．Einstein's and Hawking's theories_________．

　　A．suggest the possibility to invent the time machine

　　B．have similarities in many ways

　　C．have proved wrong by some time travelers

　　D．push the invention of the first spaceship

　　30．In Paragraph 4,“grandfather paradox” probably refers to the idea that__________．

　　A．the traveler is prevented from meeting his grandfather

　　B．the traveler goes back in time to seek for his grandfather

　　C．the grandfather's death makes the traveler's birth impossible

　　D．The reunion of the traveler and his grandfather brings happiness

　　31．According to the passage, what is probably the author's attitude towards time travel？

　　A．Supportive． B．Unconcerned．

　　C．Unclear．

　　D．Skeptical．

　　D

　　Our body clock, or natural body rhythm, influences our energy and alertness. Paying attention to it can help us choose the suitable time of the day when we best perform specific tasks.

　　The reality, however, is that most of us organize the time around work demands, school deadlines, commuting or social events. Doing whatever the body feels like doing is a luxury in today’s fast-paced modern society. But that doesn’t mean it isn’t worth trying. Obeying our body clock has significant health benefits. Disrupting our natural body rhythm, on the other hand, has been linked to problems such as depression, obesity, or headache, says Steve Key, a biology professor.

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