【单选题】When is Labor Day in the United States?
A.
The first Monday of May.
B.
The first Monday of September.
C.
The last Monday of May.
D.
The last Monday of September.
【单选题】下列四个命题, ①如果两个平面有三个公共点,那么这两个平面重合; ②如果两条直线不重合,那么他们可以确定一个平面; ③若l?α,A∈l,则A?α; ④若P∈α,P∈β,α∩β=l,则P∈l. 其中真命题的个数为( )
【单选题】下面四个说法中,正确的个数为( ) (1)如果两个平面有三个公共点,那么这两个平面重合 (2)两条直线可以确定一个平面 (3)若M∈α,M∈β,α∩β=l,则M∈l (4)空间中,相交于同一点的三直线在同一平面内.
【判断题】The Democrats occupy a dominant position in major cities, while the Republican Party is very influential in rural areas.
【简答题】世界气候大会于2009年12月7~18日在丹麦首都哥本哈根召开。来自192个国家的谈判代表召开峰会,商讨全球CO 2 减排协议。下图1为碳循环示意图,图2为食物网。请据图回答: (1)碳在生物群落内以__________的形式进行流动,在无机环境中主要以___________形式存在。 (2)碳从无机环境进入生物群落的途径①是________作用;无机环境中碳的来源有_______(填数字序号)。...
【简答题】As Crawford ____________ heartbreak in his private life, his career soared to greater heights than he could have ever dreamed of. A. contended with B. satisfied with C. corresponded with D. came...
【简答题】A very influential book to come out of the post-war world is a novel by J.D.Salinger entitled ______
【单选题】Your ______ in a job is the person who comes before you.
【单选题】The exact founder of Labor Day is not given clearly in the passage.