A scientist    496    several monkeys in order to study animal psychology. He took a glass bottle,    497    its cork (瓶塞) and put two peanuts inside it. The peanuts dropped to the bottom and were easily seen from the outside. He then passed the bottle to a monkey, who shook it    498    for a long while and was able to get the peanuts when they    499    fell out. The scientist then put some peanuts into the bottle again    500    he had done before and showed the monkey that it only needed to turn the bottle upside down for the peanuts to drop out.    501    the monkey always ignored his    502   . Each time it just shook the bottle frantically, with great    503    but without necessarily achieving    504    result.
Now the question is why the monkey was unable to understand    505    the scientist instructs.    506    because all its attentions was focused on the peanuts. Instead, it must take its eyes off the peanuts and quickly    507    its attention to the    508    movement of the scientist and the way the bottle was turned upside down. To achieve this, it had to calm down and not be    509    by the impulse (诱惑) of its appetite. Yet the monkey was not able to understand this. It is the instance like this that reveals the monkey’s some psychology is just like    510    of human beings.
496．A．kept B．rose C．fed D．caught
497．A．moving B．removed C．discovered D．covered
498．A．happily B．anxiously C．hurriedly D．instantly
499．A．suddenly B．accidentally C．occasionally D．quickly
500．A．as B．that C．what D．until
501．A．But B．When C．Therefore D．Thus
502．A．directions B．explanations C．performances D．instructions
503．A．effort B．strength C．power D．force
504．A．expecting B．interesting C．satisfying D．desired
505．A．what B．how C．why D．which
506．A．Probably B．Likely C．Simply D．Nearly
507．A．put B．send C．pay D．shift
508．A．gesture B．mouth C．hand D．eye
509．A．taken away B．taken off C．taken over D．taken on
510．A．that B．the C．those D．this
【答案】496~500.ABBBA         501~505.ADADA         506~510.CDCCA