48. What problem does Vietnam have in its control over the Mekong water resource? (A)The Mekong River has been seriously polluted. (B)Thegovernmentdoes not work hard to enforce laws. (C)Its amount and condition of the Mekong water are controlled by other countries. (D)The upstream countries refuse to share the Mekong water resource with it. www.exschool.com.twP.5