36.
(A) being linked to
(B) has been linked to
(C) had been linked to
(D) was linked to

(語境看不懂，翻譯前兩段，跟大家討論一下)
 After terrorists struck New York City on September 11, 2001, airport videotapes from Boston revealed a lost opportunity. One of the 35 hijackers, Mohammed Atta, was captured on the security cameras at Boston’s Logan Airport just before boarding his flight.

在2001九月11日，恐怖子襲擊紐約市之後，波士頓的機場錄影帶揭示了機會成本(lost opportunity意思為:選擇另一個行動後所喪失的利益。)其中一名可疑的劫機者，莫罕默德阿塔，恰好在他登機前在波士頓Logan機場的保安攝像機下被逮捕。

What if that camera 36 a computer database with Atta’s picture in it? Could security personnel have identified him as a risk and removed him from the plane?

如果那個攝影機裝有阿塔的相片在裡面呢?保安人員能將他識別為風險，從機中移除嗎?★(我一直覺得這句話很怪，前面那個問句用否定好像比較順:如果那個攝像機沒有...是不是?跟大家討論。沒有裝的時候就逮捕了一名，那裝有相片的話肯定可以抓到呀，還是這段就是在懷疑這件事的可能性...)

37 of face-recognition technology say yes. It is technically possible, they say, to build a reliable system to pick suspicious people out of a crowd by digitally photographing their faces. The possibility of preventing a terrorist attack by spotting the bad guys is 38 . Face-recognition sweeps have been used at football stadiums, in crowded streets, and at airports in the hope of doing just that. The world’s best face-recognition device is the human brain. You may wonder, 39 , how a mother or father can tell the difference between identical twins. The two children may look exactly the same to you, but the parent has no trouble telling one from the other. Somehow, the parent has focused on small combinations of features that distinguish each child. No matter how hard you try, you cannot see the same patterns.