31.Why did the mother allow her son to swim there?

　　A. He was an excellent swimmer.

　　B. The water of the river is shallow.

　　C. He was old enough to swim.

　　D. The rocks can be of help if there's danger.

　　32.The underlined part "who tends to play his cards close to his vest" probably means________.

　　A. Anton is a boy fond of swimming with other kids

　　B. Anton is unwilling to tell others what he thinks

　　C. Anton always has a desire to help others

　　D. Anton seldom changes his mind

　　33.In the mother's eyes, what her son did was_________.

　　A. dangerous but interesting

　　B. meaningful but difficult

　　C. unexpected and courageous D. awful and absurd

　　34.What might be the best title for the passage?

　　A. My Son, My Hero

　　B. Anton, A Silent Boy

　　C. A Good Deed

　　D. A Proud Mother

　　B

　　The Cuban iguana is a species of lizard（蜥蜴） of the iguana family. It is the largest of the West Indian rock iguanas, one of the most endangered groups of lizards. This species with red eyes and a thick tail is one of the largest lizards in the Caribbean.

　　The Cuban iguana is primarily herbivorous; 95% of its diet consists of the leaves, flowers and fruits from as many as 30 plant species, including the seaside rock bush and various grasses. However, Cuban iguanas occasionally consume animal matter, and individuals have been observed eating the dead flesh of birds, fish and crabs. The researchers wrote that quite a few people on Isla Magueyes could have caused this incident.

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