The European Union had approved a number of genetically modified crops until late 1998. But growing public concern over its supposed environmental and health 62. ______ risks led several EU countries to demand a moratorium(暂时 禁止) on imports of any new GM produce. By late 1999 there were enough such country to block any new approvals 63. ______ of GM produce. Last year, America filed a complaint at the WTO about the moratorium, arguing that it was an illegal trade barrier because there is no scientific base for it. 64. ______ As more studies have been completed on the effects of GM crops, the greens’ case for them has weakened. 65. ______ Much evidence has emerged of health risks from eating them. 66. ______ And, overall, the studies have shown that the environmental effects on modified crops are not always as serious as the 67. ______ greens claim. Nevertheless, environmentalists continue to find fault of such studies and argue that riley are inconclusive. 68. ______ While Americans seem be happy enough to consume 69. ______ food made from GM crops, opinion polls continue to show that European consumers dislike the idea. Europeans seem be taking the attitude which, since there remains the slightest 70. ______ possibility of adverse consequences and since it is clear how 71. ______ they, as consumers, benefit from GM crops, they would rather not run the risk.