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根据以下资料，回答13~16题。 Can animals be made to work for us？ Some scientists think that

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According to this passage, which of the following is true？ A．The Negroes came to North America in order to work for the earliest immigrants. B．The Negroes also belonged to the earliest immigrants to the North America． C．The Negroes were brought to America by chance. D．The Negroes didn't win freedom until now.

请在第_______处填上正确答案。

He was busy yesterday; otherwise he __to the meeting. A．would have come B．would come C．could come D．had come

请在第_____处填上正确答案。 A．attention B．breath C．focus D．spirit