论。通过第一段"Washington：NASA has announced evidence..."格式及文章内容可知。故选B。

Ⅱ.完形填空

The other day I was having a meal in an Italian restaurant when I got a phone call from a long lost friend.In my excitement I talked slightly __1__ than usual and in Spanish，my mother tongue.A few minutes into the __2__ the lady sitting at the table beside mine got up，seemingly __3__，and asked the restaurant staff to find for her another __4__ as far away as possible from me.I __5__ in my seat out of embarrassment，feeling the __6__ to go over and apologize.

I looked around and __7__ the lady was alone and staring out the window at the table furthest away from me.I was about to stand up when it hit me that she might prefer not to be __8__.Right then I __9__ my plans for a conventional apology and decided to conduct an experiment.Seeing those __10__ smile cards in my wallet I took one out.On signing my restaurant check I asked my waiter to __11__ charge the lady's meal to my credit card and __12__ her a smile card instead of her bill.

When I was __13__ I told the staff I would be back in a few hours to pick up my credit card and close the bill.I returned later as I promised，excited to learn the __14__ of the experiment.To my pleasant surprise，things __15__ the best possible way.The restaurant staff happily approached me，telling me that for many times she had had dinner there before __16__ had they seen the old lady smile and laugh like she did __17__ receiving the smile card and the $ __18__.She thanked the staff __19__ they explained that someone else did the job.

To top it off，the staff asked me about the smile cards so as to conduct their own __20__.It was an interesting，fun experiment which may hopefully result in many more.

【语篇解读】　本文是一篇记叙文。作者在饭店高声打电话时打扰到了一位女士，感觉过意不去，想过去给那位女士道歉。但意识到这位女士可能不愿被人打扰，于是作者想到了一个别出心裁的道歉方式：替她买单，并让服务员替自