B．it is too hard to kill a crab

　　C．a crab doesn't feel pain as a chicken or a pig does

　　D．the crab is a kind of popular and healthy seafood

　　解析：选C　细节理解题。根据第一段中的“We certainly act as if they don't.”以及第一段的最后三句内容可知，C项正确。

　　2．The underlined word “dissolves” in Paragraph 1 probably means “________”．

　　A．becomes weaker

　　B．strengthens gradually

　　C．comes into being

　　D．remains unchanged

　　解析：选A　词义猜测题。画线词所在句表示“但是当人们打开蟹爪，取出美味的蟹肉时，他们的内疚感和不安就会减弱了”。故画线词与“becomes weaker”同义，选A。

　　3．In the experiment, the shore crabs ________.

　　A．were placed into two dark shelters

　　B．were given electric shocks in the lit tank

　　C．were able to choose which shelter to go to

　　D．were put into the lit tank twice

　　解析：选C　细节理解题。根据第三段中的“Ninety crabs were placed ... made their choice ...”可知C项正确。

　　4．What does Robert W. Elwood and Barry Magee's new study prove?

　　A．It is hard to tell whether a voiceless shore crab is feeling pain or not.

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