六级改错冲刺模拟题（1）
The European Union had approved a number of genetically
modified crops until late 1998. But growing public concern
over its supposed environmental and health risks led several 1. __________
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 of GM produce. 2. __________
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. 3.__________
As more studies have been completed on the effects
of GM crops, the greens’ case for them has weakened. 4.__________
Much evidence has emerged of health risks from eating 5. __________
them. And, overall, the studies have shown that the
environmental effects on modified crops are not always