A spread-out wave will have the photoelectric effect if light hits a metal.
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Why did Dr. Thomas Harvey remove Einstein’s brain without permission in 1955?
A. Because he was a crazy fan of Einstein.
Because he would like to see whether Einstein’s brain was different from that of others’.
C. Because he wanted to figure out reasons for Einstein's death.
D. Because he wanted to prove that Einstein was a space alien.
What did Dr. Thomas Harvey find after he examined Einstein's brain?
A. He found something extraordinary.
B. He found Einstein's brain looked much like any other.
C. He found Einstein's brain was slightly smaller than average.
D. He found Einstein's brain was also gray and crinkly.
Later in his life, Einstein struggle to produce a _______________, but failed. This tells us that his brainpower was _____________.
中华民族精神源远流长,包含着丰富的内容,其中,夸父追日、大禹治水、愚公移山、精卫填海等动人的传说,体现的是中华民族精神的()。
A. 英勇奋战
B. 团结统一
C. 自强不息
D. 爱好和平