4．How many dyes have been proved successful in the experiment?

　　A．One.

　　B．Three.

　　C．Five.

　　D．Seven.

　　【解析】　细节理解题。根据最后一段倒数第二句“Only one dye，named ‘direct acid fast red’，showed up in the final，washed silk threads.”可知，只有一种染料成功了。

　　【答案】　A

　　Ⅴ.完形填空

　　Cassandra was born with a huge brown birthmark on her right cheek.However，she has __1__ to have plastic(整形)surgery to remove it.“I love my unique __2__ and believe the birthmark is a(n)__3__ feature，which makes me memorable in my dance career，”she says.

　　__4__ she was young，her parents once wanted to have it removed.As her birthmark sank through several layers of skin，plastic surgery was the only __5__ of removing it.Doctors __6__ that there would be a scar left，so they __7__ changed their mind.So far，the birthmark has been on her face for twenty­two years.She says，“I'm so __8__ that my parents chose to leave my birthmark as it's a part of who I am.I don't feel it has __9__ my development.Actually，having a birthmark __10__ me，which is important for the career I've chosen.”In July 2017，she graduated from American Musical and Dramatic Academy and stayed in Los Angeles where she now works as a professional __11__.She has starred in many plays.Although a lot of roles __12__ performers to have a certain appearance，Cassandra's outstanding performance has won a lot of __13__ for her.

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