What do we know about Obama？A.He no longer smokes.B.He still smokes as usual.C.He began to smoke at eigh.D.He is trying hard to give up smoking.

问题：What do we know about Obama?

A. He no longer smokes.

B. He still smokes as usual.

C. He began to smoke at eight.

D. He is trying hard to give up smoking.

为了给出正确答案及解析，我需要先假设一段与问题相关的背景信息，因为原始问题中并未提供具体的文章内容。假设我们有以下关于Obama的吸烟习惯的信息：

\"Obama, the former President of the United States, has been known for his efforts to quit smoking. After years of public and private struggles with the habit, he finally announced that he had successfully kicked the habit and no longer smokes.\

基于这段假设的信息，我们可以进行以下解析：

A. He no longer smokes. - 这个选项与假设信息中的“he had successfully kicked the habit and no longer smokes”相吻合，表示Obama已经不再吸烟了。

B. He still smokes as usual. - 这个选项与假设信息相矛盾，因为文中明确表示Obama已经成功。

C. He began to smoke at eight. - 这个选项并未在假设信息中提到，且与问题“我们现在对Obama了解什么”不直接相关，因为它询问的是现在的状况，而不是过去的开始时间。

D. He is trying hard to give up smoking. - 这个选项表示Obama正在努力，但根据假设信息，他已经成功了，所以不再是“正在努力”。

正确答案是A：He no longer smokes。这个选项直接反映了假设信息中提到的Obama已经成功的现状。

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