The most famous animal said to be capable of counting was a horse in Germany at the beginning of the 19th century called Clever Hans. The horse’s owner    that animals could think and reason as we can and that this    could come from training them. He trained Clever Hans to give the     to arithmetic (算术的) problems; the horse gave the correct answer by    the right number of times with its forefoot. The animal gave the correct answers not only to additions but to other arithmetic, too. It also gave the right answers when the questions were shown to it on a card.
This    was talked about so much that scientists studied the horse’s      . The committee, after a(n)    study, found that Clever Hans’ owner and trainer was    . He had not deliberately trained his horse to stop tapping by giving it a slight    . Members of the committee got the right answers from Hans    when the owner wasn’t there,    that this type of trickery (诡计) hadn’t happened.
It looked as if the horse really could think and    . But soon after this another scientist found that if the horse was asked questions to which none of the people there knew the answers, then the animal     gave a correct answer. The questions were asked by showing the horse a card that the questioner himself had not     .
This biologist soon discovered that the horse had actually    to very slight unconscious (下意识的) movements of head or body made by a questioner who knew the    number of taps. He counted the taps to himself, and when the horse got to the right number, the questioner’s tension (紧张感) was    by a small, unconscious movement of his head or body. The horse then     tapping. Questioners who didn’t know the answer didn’t do this. The horse had really    itself to answer these very small    during its training.

A．believed B．remembered C．expected D．doubted

A．chance B．knowledge C．method D．ability

A．explanations B．information C．answers D．facts

A．jumping B．tapping C．moving D．dropping

A．problem B．program C．case D．model

A．interests B．activities C．habits D．powers

A．careful B．simple C．general D．extra

A．honest B．creative C．independent D．patient

A．praise B．hint C．trust D．attention

A．still B．nearly C．even D．only

A．knowing B．considering C．pretending D．proving

A．work B．play C．count D．argue

A．never B．sometimes C．always D．ever

A．designed B．read C．improved D．answered

A．responded B．returned C．complained D．compared

A．various B．correct C．strange D．direct

A．ignored B．checked C．offered D．shown

A．Practiced B．continued C．stopped D．began

A．permitted B．taught C．regretted D．forced

A．suggestions B．instructions C．questions D．movements