通過(guò)以下真題長(zhǎng)句的演練分析，希望同學(xué)們熟知分析長(zhǎng)難句的切入點(diǎn)，將長(zhǎng)難句化繁為簡(jiǎn)地進(jìn)行理解。

　　1. Research has found that IQ predicted leadership skills when the tests were given under low-stress conditions, but under high-stress conditions, IQ was negatively correlated with leadership—that is, it predicted opposite.

　　【解析】

　　本句主干是Research has found that…, that引導(dǎo)的是賓語(yǔ)從句，直到句末。此賓語(yǔ)從句是由but連接的兩個(gè)表示對(duì)比關(guān)系的并列分句組成，第一個(gè)分句的主干是IQ predicted leadership skills,其后是條件狀語(yǔ)從句when the tests were given under low-stress conditions;第二個(gè)分句的主干是IQ was negatively correlated with leadership,之前的介詞結(jié)構(gòu)under high-stress conditions作狀語(yǔ)，是個(gè)省略結(jié)構(gòu)，補(bǔ)充完整后應(yīng)為when the tests were given under high-stress conditions。由that is(即，就是說(shuō))可知，破折號(hào)之后的句子是對(duì)前面主句的補(bǔ)充說(shuō)明。

　　【參考譯文】

　　研究發(fā)現(xiàn)如果在壓力小的時(shí)候測(cè)試，那么IQ結(jié)果就能預(yù)測(cè)出領(lǐng)導(dǎo)能力，但如果在壓力大的時(shí)候測(cè)試，IQ結(jié)果就會(huì)與領(lǐng)導(dǎo)能力相反——也就是說(shuō)，它的預(yù)測(cè)是相反的。

　　2. But science does provide us with the best available guide to the future, and it is critical that our nation and the world base important polices on the best judgments that science can provide concerning the future consequence of present actions.

　　【解析】

　　本句是由and連接的兩個(gè)并列分句組成，其中第一個(gè)分句較為簡(jiǎn)單，但要注意does的強(qiáng)調(diào)用法。第二個(gè)分句中it是形式主語(yǔ)，真正的主語(yǔ)是由that引導(dǎo)的主語(yǔ)從句that our nation and the world base important policies on the best judgments,第二個(gè)由that引導(dǎo)的從句that science…of present actions是定語(yǔ)從句，修飾先行詞judgments。

　　【參考譯文】

　　但是科學(xué)確實(shí)為我們提供了對(duì)未來(lái)的最可靠的指引。關(guān)鍵是我們的國(guó)家乃至全世界在做出重要決策時(shí)，應(yīng)以科學(xué)能提供給我們的、關(guān)于人類現(xiàn)在行為對(duì)未來(lái)影響的最佳判斷為依據(jù)。