单项选择题

A．A holiday.
B．Luck.
C．Work..
D．An accident.
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单项选择题
A．The possible existence of life on other planets.B．Methods for building powerful new telescopes.C．A technical problem that astronomers can’t solve.D．The discovery of planets orbiting distant stars.
A．The possible existence of life on other planets.
B．Methods for building powerful new telescopes.
C．A technical problem that astronomers can’t solve.
D．The discovery of planets orbiting distant stars.
填空题
Research with animal behavior risks wrongly attributing ___________________________________.
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