正确答案: D

爱因斯坦

题目：20世纪初，提出光量子假说，解决经典物理学无法解释的光电效应问题的科学家是

解析：D

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学习资料的答案和解析：

[单选题]How does the author seem to feel about the future of newspapers?

Worried

[单选题]We can learn from the passage that __

one's inability to speak up is culturally determined sometimes

[单选题]木兰科、蓼科、十字花科和大戟科植物均为单叶。( )

错误