问题 选择题

现对下列9种物质进行分类:①锰酸钾;②氧化铁;③氨气;④液氧;⑤冰水;⑥镁;⑦二氧化碳;⑧空气;⑨水银  下列分类正确的是(  )

A.混合物:④⑤⑧

B.常温下的气态纯净物:③⑦

C.单质:④⑥

D.氧化物:①②⑤⑦

答案

A、液氧、冰水是由一种物质组成的,属于纯净物.故错

B、氨气、二氧化碳常温是气态是由一种物质组成的,属于纯净物.故对

C、液氧和镁、水银是由同种元素组成的纯净物,属于单质;故错

D、锰酸钾是由三种元素组成的,不是氧化物;故错

故选B

单项选择题

Millions of Americans and foreigners see GI.Joe as a mindless war toy, the symbol of American military adventurism, but that’ s not how it used to be. To the men and women who (1) in World War I1 and the people they liberated, the GI. was the (2) man grown into hero, the pool farm kid torn away from his home, the guy who (3) all the burdens of battle, who slept in cold foxholes, who went without the (4) of 1hod and shelter, who stuck it out and drove back the Nazi reign of murder. This was not a vohmteer soldier, not someone well paid, (5) an average guy, up (6) the best trained, best equipped, fiercest, most brutal enemies seen in centuries.

His name is not much. GI. is just a military abbreviation (7) Govermnent Issue, and it was on all of the article (8) to soldiers. And Joe A common name for a guy who never (9) it to the top. Joe Blow, Joe Magrae... a working class name.The United States has (10) had a president or vieepresident or secretary of state Joe.

GI. Joe had a (11) career fighting Geman, Japanese, and Korean troops. He appears as a character, or a (12) of American personalities, in the 1945 movie The Story of GL Joe, based on the last days of war correspondent Ernie Pyle. Some of the soldiers Pyle (13) portrayde themselves in the fihn. Pyle was famous for covering the (14) side of the warl, writing about the dirt-snow-and-mud soldiers, not how many miles were (15) or what towns were captured or liberated. His reports (16) the "willie" cartoons of famed Stars and Stripes artist Bill Maulden. Both men (17) the dirt and exhaustion of war, the (18) of civilization that the soldiers shared with each other and the civilians: coffee, tobacco, whiskey, shelter, sleep. (19) Egypt, France, and a dozen more countries, G. I. Joe was any American soldier, (20) the most important person in their lives.

(6)()

A.for

B.into

C.form

D.against

选择题