The statement “For all positive integers n, n² + n is even.” can be proven by___. A. example B. contradiction C. induction D. deduction 相关知识点: 试题来源: 解析 C。本题考查证明方法。对于“对于所有正整数 n,n² + n 是偶数。”可以通过数学归纳法来证明。选项 A,仅举例子...
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题目 Which statement is a theory, and not a proven fact? (Text A) A.Our universe is the product of a black hole in another, older universe.B.The black hole in our galaxy is pulling a gas cloud toward itself.C.There are more than 100 billion galaxies in the universe.D.Black ho...
C.statement D.announcement 18.A.found B.doubted C.remembered D.wondered 19.A.advice B.appointment C.suggestion D.attention 20.A.amazing B.confusing C.disappointing D.challenging Ⅳ.语法填空 Newparentswhocleantheirhomesveryoften1. (protect)theirbabiesfrombacteriaandotherorganismsmightwanttocutback thei...
A. Black holes are extremely common. B. There are more than 100 billion galaxies in the universe. C. The black hole in our galaxy is pulling a gas cloud toward itself. D. Our universe is the product of a black hole in another, older universe. 相关知识点: 试题...
D. It is becoming more international. 35. Which statement will the author probably agree with? A. A city can be young and old at the same time. B. A city built on ancient cultures is more dynamic. C. Modernity is usually achieved at the cost of elegance. D. Compromise should be ...
Which statement is a theory, and not a proven fact? (Text A) A、Black holes are extremely common. B、There are more than 100 billion galaxies in the universe. C、The black hole in our galaxy is pulling a gas cloud toward itself. D、Our universe is the product of a black hole ...
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