阅读下面短文，按照句子结构的语法性和上下行文连贯的要求，在空格处填入一个适当的词或是括号中词语的正确形式填空Ifyougoouttothefieldsatnight

Question

   阅读下面短文，按照句子结构的语法性和上下行文连贯的要求，在空格处填入一个适当的词或是括号中词语的正确形式填空

   If you go out to the fields at night in spring or summer you can hear frogs singing  46   (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 fast- moving insects. Each frog eats a large number of pests that are harmful  47  crops. This little creature is regarded  48     "the natural enemy of pests".

    49  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 _50 _ shameless （无耻的） and cruel act isn't it?   51   cause ( 起因） 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  52  eating poison-killed insects.

   Something must be done without delay  53 ( save) frogs. If we don't punish those  54  sell and kill frogs to make money then one day all of us  55 (punish) by nature for failing to keep the balance of nature.

Answer 1