CPU不能直接访问的是( )。A．ROM B．RAM C．Cache D．光盘

顺水推舟我能行（在括号里填上合适的词语）    

茂密的(            )      热情(            )      激烈的(            )      感情(            )    

忠实的(            )      豪情(            )      明亮的(            )      心情(            )    

深厚的(            )      激情(            )

2010年美、日三位科学家因钯（Pd）催化的交叉偶联反应获诺贝尔化学奖．一种钯催化的交叉偶联反应如下：

（R、R’为烃基或其他基团）

应用上述反应原理合成防晒霜主要成分K的路线如图所示（部分反应试剂和条件未注明）：

已知：①B能发生银镜反应，1mol B 最多与2mol H₂ 反应．

②C₈H₁₇OH分子中只有一个支链，且为乙基，其连续氧化的产物能与NaHCO₃反应生成CO₂，其消去产物的分子中只有一个碳原子上没有氢．

③G不能与NaOH溶液反应．

④核磁共振图谱显示J分子有3种不同的氢原子．

请回答：

（1）B中含有的官能团的名称是______．

（2）B→D的反应类型是______．

（3）D→E的化学方程式是______．

（4）有机物的结构简式：G______；K______．

（5）符合下列条件的X的同分异构体有（包括顺反异构）______种，其中一种的结构简式是______．

a．相对分子质量是86         b．与D互为同系物

（6）分离提纯中间产物E的操作：先用碱除去D和H₂SO₄，再用水洗涤，弃去水层，最终通过______操作除去C₈H₁₇OH，精制得E．

阅读理解。

     You might say that one reason Barack Obama is the President of the US is because he knows how to

give a good speech. In 2004, when Massachusetts Senator(参议员) John Kerry was the Democratic

Party’s nominee（被提名者） for the presidency, a little-known senator from Illinois gave the keynote

speech at the Democratic National Convention. That senator was Obama. It was a remarkable speech -- poetic, and inspiring. The people who heard it would remember it for a long time. 

     Since 2004, Obama has written and delivered thousands of speeches. These are usually praised for

two reasons: he treats the audiences like intelligent adults, and he is able to express complicated ideas in

an easy, natural way. Before becoming president, Obama was a lawyer, a college professor, and a

successful writer -- his two memoirs(回忆录) have become best-sellers. The skills he needed to succeed

in his previous jobs have also contributed to his success as a speechmaker.

     Writing team: Obama has a team of people who write his speeches. The writers chat with Obama for

hours about what he wants to say. They listen to recordings of past presidential addresses and seek advice from advisers. Obama usually edits and rewrites the drafts several times.

     Obama’s tricks for a lighthearted speech that stays on message:

     Make fun of the guests. Obama starts his speech by gently teasing his guests. His opening lines grab the audience’s attention while giving them an opportunity to relax and laugh at themselves and each other.

     Make fun of yourself. A good rule for speechmakers: If you’re going to make a joke about someone

else, be sure to make one about yourself, too. Obama mocks his own poor choices for filling the position

of Commerce Secretary, saying, "No President in history has ever named three Commerce Secretaries this quickly.”

1. Obama made the poetic and inspiring speech in 2004 as________.

A. president              

B. a nominee for the presidency

C. a senator              

D. a secretary

2. What’s the meaning of the underlined word in paragraph 2?

A. Difficult to understand.      

B. Easy to understand.

C. Different from others        

D. Interesting to say.

3. According to the passage, we know that before becoming president, _________.

A. Obama was once a lawyer, a doctor and a college professor.

B. Obama was a successful writer.

C. Obama’s three memoirs have become best-sellers.

D. Obama’s former jobs have nothing to do with his speech.

4. According to paragraph 3, we know that _________.

A. Obama writes his speech himself.

B. the writers chat with Obama only for minutes before writing.

C. the writers never listen to recordings of past presidential speeches.

D. Obama is serious with his speech.

5. What’s the best title of the passage?

A. Secret of Obama’s successful speeches.  

B. Obama’s successful speeches.

C. Obama’s way of making speeches.      

D. Problems of Obama’s speeches.

一棵二叉树中共有70个叶子结点与80个度为1的结点，则该二叉树中的总结点数为

A．219

B．221

C．229

D．231