Flowers and Yeo have started programme A ：to find ways to prevent water pollution. B ：to identify genes that promote growth in salty soil. C ：to breed rice plants that taste salty. D ：to find ways to remove excessive salt from soil. 请选择答案： A:B:C:D:8 、 Which of the following is NOT mentioned as cause of the prolem discussed in the pass A ：Natural barriers to sea water have been destroyed. B ：The water table has gone down after droughts. C ：Sea level has been continuously rising. D ：Evaporation of water leaves salt behind.