A、His 50th birthday. B、NASA’s 50th anniversary. C、The University’s 50th anniversary. D、The US Cosmology Association’ s 50th anni

Steven Hawking: Life on other planets is likely, but intelligent life is less likely. Famed astrophysicist Stephen Hawking has been thinking a lot about the cosmic question, "Are we alone?" The answer is probably not, he says. If there is life elsewhere in the universe, Hawking asks why we haven’ t stumbled onto some alien broadcasts in space, maybe something like "alien quiz shows" Hawking’ s comments were part of the lecture at George Washington University on Monday in honor of NASA’ s 50th anniversary. He theorized that there are possible answers to whether there is extraterrestrial ET life. One option is that there likely isn’t any life elsewhere. Or maybe there is intelligent life elsewhere, but it gets smart enough to send signals into space; it is also smart enough to make destructive nuclear weapons ($Sfc8§) ? Hawking said he prefers the third opinion: " Primitive life is very common and intelligent life is fairly rare," he then quickly added." Some would say it has yet to occur on earth. "
    Q25: What is the passage mainly a-bout?
    Q26: What is the event that Hawking delivered his lecture at George Washington University?
    Q27: What is the idea Hawking favors in terms of extraterrestrial life?