下面的句子组合成一段语意连贯的话，最恰当的一组是   （   ）

①因此对太阳的各种研究，很有可能会使人们对遥远恒星甚至宇宙的认识更近一步，所以其科学价值非同一般。

②经过对爱丁顿博士观测取得的资料的测量、分析和计算，得到的偏角为1.64角秒。

③太阳虽然与天上的群星一样，只是一颗普通的自己能发光的星，但是它比其他的恒星距离我们要近得多。

④这一数值和爱因斯坦理论上预言的1.75角秒非常接近。这就无可辩驳地验证了广义相对论的正确性。

⑤科学史上最著名的一次日全食观测是1919年5月29日英国剑桥天文台爱丁顿博士进行的观测。

⑥事实上，从古到今科学家们十分重视对日全食的观测。

A．⑥⑤②④③①

B．⑤②④⑥③①

C．③①⑤②④⑥

D．③①⑥⑤②④

President Bush arrived in Washington and forged ahead with an ambitious agenda- (1) tax cuts, vast changes in federal social programs, expansions of executive power and (2) broad remaking of energy and education policies.
Claiming a mandate by simply declaring (3) existence, his early successes dazzled his critics. With guru Karl Rove directing the (4) , Bush won a stunning series of political victories.
He muscled his agenda through (5) friendly Congress, and gained seats for his party in the 2002 midterm elections. (6) biggest triumph came in 2004, when he won a second term despite a (7) unpopular war.
The "permanent" Republican majority he and Rove envisioned even seemed attainable (8) Bush plunged himself into his most ambitious legislative effort yet: a partial privatization (9) Social Security.
But the president who boasted about "political capital" in the heady (10) after his re-election now faces the worst of political fates as he enters (11) final year in office: borderline irrelevance.
The president’s second term has (12) defined by legislative paralysis, marked by record-low approval ratings, presidential candidates who are (13) from his shadow, and a lingering war that’s sapping his remaining reservoirs of (14) .
As he enters his final year in office with the war continuing, Republican (15) for president bolting from his shadow, and his party back in the minority (16) Congress, he is politically weakened, an early entry into lame-duck status.
And the (17) Washington atmosphere he hoped to cure is just as nasty as it was (18) he came to office seven years ago.
"lie’s left our political institutions much (19) troubled than they were before," said Thomas E. Mann, a senior fellow at (20) Brookings Institution, a Washington-based think tank. "He didn’t create the ideological polarization, but he magnified it. \