C．practical

　　D．annoying

　　解析：此处选annoying“令人恼怒的”与前面的“great”相对。D

　　19．A.early

　　B．regularly

　　C．immediately

　　D．punctually

　　解析：句意：如果高年级学生想停在前面他们就应该早点来学校。A

　　20．A.restrictions

　　B．additions句意：高年级学生可以有其他的特权但是专用停车场不应该是特权之一。特权优先权”。C

　　语法填空

　　If you go out to the fields at night in spring or summer, you can hear frogs singing21.________(joy) here and there.It seems as if they were performing a field symphony.

　　The frog is a good and useful creature that benefits human beings.They can catch fast­moving insects.Each frog eats a large number of pests that are harmful22.________crops.This little creature is regarded23.________“the natural enemy of pests”．

　　24．________ now frogs are getting fewer and fewer.This is because they are killed and put on the table as a delicious dish by their chief enemy－human beings.It is ________shameless and cruel act, isn't it？________ cause responsible for the rapid reduction of frogs is that farmers use insecticides (杀虫剂) to kill pests and frogs get killed as a result of drinking poisoned water ________ eating poison­killed insects.

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