28．A.should

　　B．need

　　C．will

　　D. must

　　29．A.immediately

　　B．certainly

　　C．simply

　　D. gradually

　　30．A.that

　　B．what

　　C．those

　　D. ones

　　31．A.difficult

　　B．interesting

　　C．ordinary

　　D. unusual

　　32．A. draw

　　B．get

　　C．decide

　　D. give

　　33．A. strange

　　B．standard

　　C．exact

　　D. serious

　　34．A. Therefore

　　B．However

　　C．Besides

　　D. Though

　　35．A. normal

　　B．happy

　　C．good

　　D. better

　　Ⅲ.阅读理解

　　Human beings can use language to communicate，but what about animals? How do they communicate with each other without using language? Well，different species use different types of communication.

　　Sounds are one of the most common types of communication in animals and the majority of the species use them as the medium to convey messages.Bats usually follow sound waves to communicate.All the birds communicate through their chirping(吱喳) and use ultrasound waves.Mammals，generally，make use of sounds to give calls to other members of their community.Whales are the perfect users of sound waves.They have a whale song，which they repeat after regular intervals.

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