The European Union had approved a number of genetically modified crops until late 1998. But growing public concern over its supp

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问题    The European Union had approved a number of
genetically modified crops until late 1998. But growing
public concern over its supposed environmental and health          【S1】______
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          【S2】______
of GM produce. Last year, America filed a complaint at file
WTO about the moratorium, arguing that it was an illegal
trade barrier because there is no scientific base for it.          【S3】______
   As more studies have been completed on the effects of
GM crops, the greens’ case for them has weakened.                  【S4】______
Much evidence has emerged of health risks from eating them.        【S5】______
And, overall, the studies have shown that the environmental
effects on modified crops are not always as serious as the         【S6】______
greens claim. Nevertheless, environmentalists continue to find
fault of such studies and argue that they are inconclusive.        【S7】______
   While Americans seem be happy enough to consume                【S8】______
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       【S9】______
possibility of adverse consequences and since it is clear how      【S10】______
they, as consumers, benefit from GM crops, they would
rather not run the risk.

选项

答案its→their

解析 its指代的genetically modified crops(转基因农作物)为复数,所以应将its改成their。
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