043.
Forty-eight years ago Martin Luther King had a dream of an America where men and women would be judged not on the colour of their skin but on the content of their character. Today what America has done is turning that dream into reality.
After a hard-fought campaign, Democratic Senator Barack Obama won the US presidential election, and became the 44th President of the United States--the first African-American in the country's history to do so.
President-elect Obama did not take office until January 20th, 2009. However, when he became president, he faced many serious challenges, including two foreign wars, climate change and what he described as "the worst financial crisis in a century".
But Obama himself appeared to enjoy the flavor of the challenge. In his victory speech, "The road ahead will be long. Our climb will be difficult. We may not get there in one year or even in one term, but America--I have never been more hopeful than I am tonight that we will get there," said the President of the United States.

答案解析：
(1) 正確答案為B。根據(jù)the first African-American in the country's history to do so.他是美國歷史上第一位當(dāng)選總統(tǒng)的非洲裔美國人。可推知，他是美國首位黑人總統(tǒng)，因此B項(xiàng)正確。
(2) 正確答案為A。根據(jù)he faced many serious challenges, including two foreign wars, climate change and what he described as "the worst financial crisis in a century".他面臨著許多嚴(yán)峻的挑戰(zhàn)，包括兩個(gè)國外戰(zhàn)爭，氣候變化，以及他稱為“一個(gè)世紀(jì)以來最嚴(yán)重的金融危機(jī)”。可知，奧巴馬面臨的挑戰(zhàn)包括氣候變化和金融危機(jī)，而內(nèi)戰(zhàn)則不包括在內(nèi)，因此A項(xiàng)正確。
(3) 正確答案為A。根據(jù)President-elect Obama did not take office until January 20th, 2009. 奧巴馬當(dāng)選總統(tǒng)后直到2009年1月20日才就職。可知，奧巴馬于2009年1月20日開始就職總統(tǒng)，因此A項(xiàng)正確。
(4) 正確答案為B。根據(jù)but America--I have never been more hopeful than I am tonight that we will get there但是美國，我今晚比任何時(shí)候都充滿希望，我們會(huì)達(dá)成目標(biāo)。可知，奧巴馬感到充滿希望，而且自信，因此B項(xiàng)正確。