题目内容

But even after the abolition of slavery, organized or individual discrimination was practiced against ______.

A. Chinese - Americans
B. American Indians
C. Japanese - Americans
D. black Americans

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The 18th century saw selective breeding of cattle, sheep and houses by _________.

A. Jethro Tull
B. Thomas Coke
C. George III
D. Robert Bakewell

Irish broadcasting began in ______ in a small studio called Dublin Broadcasting Station.

A. 1906
B. 1916
C. 1926
D. 1936

In some areas factory farming methods are used, particularly for ________.

A. growing crop
B. producing milk
C. catching fish
D. rearing poultry

有哪些实验证据农明肽漩转移酌是rRNA,而不是蛋白质？rRNA催化功能的发现有什么意义？