As the name suggests, puffer fish can inflate to make themselves seem much larger than they really are, thus scaring off enemies. They do this by filling their stomachs, which are extremely elastic(弹性的), with water. If that’s not enough of a threat, the tiger puffer fish --- like most of the other puffer fish in the family --- carries a deadly toxin(毒素). Eat one puffer fish and the poison will paralyze (瘫痪) your muscles, including the muscles responsible for breathing, so death is usually caused by a lack of oxygen. Famously, the fish is a delicacy in Japan, where highly qualified chefs produce dishes that contain the safe level of the poison. Interestingly, the puffer fish does not go to the trouble of producing the poison itself. Instead, it hosts bacteria (细菌) that produce the stuff. It obtains these bacteria from its diet, so the youngest adult fish are not poisonous.

　　47.

　　All of the following statements account for the violence of puffer fish except that_____.

　　A. they are very difficult to catch

　　B. they can become larger to threaten enemies away

　　C. they kill their younger companions as they grow up

　　D. they are deadly poisonous

　　48.

　　We can learn from the second paragraph that puffer fish _____.

　　A. can only grow to a weight of 0.1g

　　B. do not change their behavior as they grow up

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