正确答案: A

正确

题目：成熟的绒毡层细胞一般具双核和单核。( )

解析：A

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举一反三的答案和解析：

[单选题]At what time of the school term does the conversation most probably take place?

At the beginning of it.

[单选题]D On May 23,1989, Stefania Follini came out from a cave at Carlsbad , New Mexico. She hadn’t seen the sun for eighteen and a half weeks . Stefania was in a research program, and the scientists in the program were studying body rhythms (节奏)。In this experiment Stefania had spent 130 days in a cave ,30 feet in depth.During her time in the cave, Stefania had been completely alone except for two white mice. Her living place had been very comfortable ,but there had been nothing to fell her the time .she’d had no clock or watches , no television or tadio. There had been NO natural light and the temperature had always been kept at 21℃

she was the subject of astudy