[C] propose an objective attitude to it.

　　[D] exhibit its advantages diagnoses purveyors.

　　核心詞匯

　　pitch n. 程度,投擲,音高;v. 投,向前傾跌,扎牢,定調(diào),用瀝青覆蓋

　　malnutrition n. 營養(yǎng)不良

　　maize n. 玉米

　　dioxin n. [化] 二氧(雜)芑

　　herbicide n. 除草劑

　　outweigh v. 比…重,比…重要,比…有價值

　　pesticide n. 殺蟲劑

　　fret n. 煩躁,磨損,焦急;v. 煩惱,不滿,磨損

　　bugs a. 瘋狂的,發(fā)瘋的

　　nasty a. 污穢的,下流的,險惡的,脾氣不好的,惡意的
難句剖析

　　1. Critics assert that genetic engineering introduces into food genes that are not present naturally, can not be introduced through conventional breeding and may have unknown health effects that should be investigated before the food is sold to the public .

　　【解析】 本句的主干是Critics assert that…。第一個that引導(dǎo)賓語從句，第二個that引導(dǎo)定語從句修飾food genes，第三個that是代詞，指代food genes。

　　【譯文】 批評家認(rèn)為基因工程引進(jìn)的食物基因不是自然存在的，不能通過傳統(tǒng)飼養(yǎng)方法引進(jìn)，可能有未知的健康危害，因此應(yīng)該在食物出售給公眾之前對其進(jìn)行檢查。

　　2. The producers argue that the engineered trait—such as resistance to certain brands of herbicide or types of insects and virus—actually do ecological good by reducing chemical use and improving yields so that less land needs to go under the plough.

　　【解析】 句子的主干是The producers argue that…。that引導(dǎo)賓語從句, 賓語從句是“the engineered trait…actually do ecological good”;such as…是對engineered trait的進(jìn)一步解釋說明 。

　　【譯文】 生產(chǎn)者認(rèn)為像抵抗某種除草劑或一些種類的昆蟲和病毒這樣的特點確實對生態(tài)有益，因為它們減少了化學(xué)用品的使用，并且提高了生產(chǎn)量從而減少了對耕地的需要。

　　3. The only way to discover whether they will arise in real life, or whether they wi