B.Relief efforts are proved most fruitful due to the effectiveness of certain pesticides.

　　C.Dieldrin, the most effective locust killer, has been widely accepted in many countries.

　　D.Over 10 million acres of affected area will have been treated with locust-killing chemicals by the end of June.

　　5.The purpose for affected nations to meet in Algiers on May 30 is ___.

　　A.to devise antilocust plans.

　　B.to wipe out the swarms in two years.

　　C.to call out for additional financial aid from other nations.

　　D.to bring the insects under control before the plague gets worse.

　　第二十五篇答案：BBADA