3. Which of the following is NOT true about the Pals and Paws Agility Trial?
A. It is held every year in New York City.
B. There’re about 100 dogs involved this year.
C. Ribbons and honors are given to best dogs.
D. Dog agility is one of the most popular items.
【解析】选A。细节理解题。A项是张冠李戴错误, 这与原文第二段不一致; 其余选项与全文信息一致。
4. According to the passage, who went to the Pals and Paws Agility Trial simply for fun?
A. Liz McGuire B. Suzanne Wesley
C. Terry Herman
D. Hunter Moore
【解析】选D。细节理解题。依据最后一段For dog owners like Hunter Moore, however, the Pals and Paws Agility Trial was pure entertainment. 得知Hunter Moore参与的目的纯粹是娱乐而不是获奖。
Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the color of a dark-striped zebrafish(斑马鱼) to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebrafish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.
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