The European Union had approved a number of genetically modified crops until 1998. But growing public concern over its S1.______ supposed environmental and health risks led several EU countries to demand a moratorium(暂时禁止) on imports of any new GM produce. By lately 1999 there were enough such countries to block S2.______ any new approvals 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 scientific basis for it. As more studies have been completed S3.______ on the effects of GM crops, the green's case against them has S4.______ weakened. Much evidence has emerged of health risks from eating them. S5.______ And, overall, the studies have shown that the environmental effects of modifying crops are not always as serious as the greens S6.______ claim. Nevertheless, environmentalists continue to find fault with such studies and argue which they are inconclusive. S7.______ While Americans seem happy enough to consume food made from GM crops, opinion polls continue to show that European consumers dislike the idea. Europeans seem to be taken the attitude S8.______ which, since there remains the slightest possibility of adverse consequences and since it was still unclear how they, as consumers S9.______ benefit of GM crops, they would rather not run the risk. S10.______ 【S1】