20．A.educated

　　B．understood

　　C．known

　　D．developed

　　解析：选C　句意：英国畅销书作家Wendy Holden也在一本暖心的儿童书中写到了这段感人的友谊，这本书在2月13号发行，让Owen和Haatchi更加广为人知。know“知道”，符合题意。

　　课时练(二)　阅读理解提速练(练速度)

　　(限时：35分钟)

　　Ⅰ.阅读理解

　　A

　　(2016·东北三省三校第一次联考)Scientists in Argentina have created the world's first cow with two human genes that will enable it to produce human­like milk.

　　Genetic engineering was used to introduce the “mothers' milk” genes into the animal before birth, according to the National Institute of Agribusiness Technology in Buenos Aires.

　　As an adult, the cloned cow “will produce milk that is similar to that of humans”， which will prove “a development of great importance for the nutrition of infants (婴儿)”， said the institute. “The cloned cow, named Rosita ISA, is the first in the world with two human genes that contain the proteins present in human milk，” said the statement.

　　In April, scientists in China published details of research showing that they had created dairy cows which produced milk containing proteins found in human breast milk. But the Argentine team said the Chinese only introduced one human gene, while their research involved two, meaning the milk will more_closely_resemble that of humans.

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