2. 外语
  3. While Americans have no reason to be terrified to sit down at the dinner table, they have each reason to demand significant impr

While Americans have no reason to be terrified to sit down at the dinner table, they have each reason to demand significant impr

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问题     While Americans have no reason to be terrified to sit down at the dinner
table, they have each reason to demand significant improvements in food and 【M1】______
water safety.
    They unconsciously and unwillingly take too much of too many 【M2】______
dangerous chemical. If food already contains natural carcinogens, 【M3】______
this does not make much sense to add dozens of 【M4】______
newly man-made ones. Though most people will withstand the 【M5】______
small amounts of contaminants generally find in food and water, 【M6】______
but at least a few individuals will probably get cancer 【M7】______
one day because of what they eat and drink.
    To make good food and water supplies even better, the Government
needs to narrow its regulatory standards, stiffen its inspection program and 【M8】______
loosen its enforcement policies. 【M9】______
    The food industry should modify some long-accepted practices or turn to
fewer hazardous alternatives. Perhaps most important, consumers will have 【M10】______
to do a better job of learning how to handle and cook food properly.
【M4】
选项
答案this — it
解析 this应换成it，因为在这句话里代词应充当形式主语的角色代替后面的不定式结构toadd dozens of newly man-made ones，只有it可充当形式主语，this不能。
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