问题 填空题

(5分)现有①水蒸气②铁粉③高锰酸钾④液态空气⑤矿泉水⑥二氧化锰⑦过氧化氢七种物质,其中属于混合物的有(填序号)        ,属于纯净物的有           (填序号),属于单质的有       (填化学符号),属于化合物的有                (填序号)。

答案

④⑤;⑤②③⑥⑦;Fe;H2O、KMnO4、MnO2、H2O2;     ①⑥⑦

由两种或两种以上的物质混合而成的物质是混合物;由不同种元素组成的纯净物是化合物;由同种元素组成的纯净物是单质;由不同种元素组成的纯净物是混合物。根据以上概念进行分析判断.

①水蒸气是纯净物,是化合物;②铁粉是纯净物,是单质;③高锰酸钾是纯净物,是化合物;④液态空气是混合物;⑤矿泉水是混合物;⑥二氧化锰是纯净物,是化合物;⑦过氧化氢是纯净物,是化合物。

阅读理解

After more than a year of bitter political debate, President Obama sat down in the White House East Room on March 23 and signed the 2010 Patient Protection and Affordable Care Act into law with a pen,and then another pen,and another. Obama used 22 pens to sign the $938 billion health care bill.

The practice of using different pens to sign important legislation(法规)dates at least as far back as Franklin Roosevelt. The reason is fairly simple. The pen used to sign historic legislation itself becomes a historical artifact. The more pens a President uses, the more thank-you gifts he can offer to those who helped create that piece of history. The White House often give pens to supporters of the newly signed legislation. When Lyndon Johnson signed the Civil Rights Act in 1964, he reportedly used more than 75 pens and gave one of the first ones to Martin Luther King Jr. And in 1996, President Clinton gave the four pens he used to sign the Line-Item Veto bill to those most likely to appreciate the bill's consequence.

Once they're given away, some pens end up in museums; others are displayed proudly in recipients'(接受者) offices or homes. But they sometimes appear again, like in the 2008 presidential campaign(竞选活动), when John Macain promised to use the same pen given to him by President Reagan to cut pork from the federal budget.

Not every President goes for the multipen signature, however. President George W. Bush preferred signing bills with only one pen and then offering several unused "gift" pens as souvenirs.

小题1:.We can learn from paragraph 1 that the 2010 Patient Protection and Affordable Care Act        .

A.has been passed easily

B.was put forward one year ago

C.becomes law in the USA

D.is unimportant小题2:How are the pens dealt with after being used by President Obama?

A.Supporters of the newly signed legislation are likely to get some of them.

B.Obama will keep them.

C.They will be just set aside

D.They will be sold to the public at a high price.小题3:What can we learn about John Macain?

A. He was ever President in the USA.

B. He took part in the 2008 presidential campaign.

C. He never used the pen given by Reagan.

D. He was only concerned about his own business.   

小题4:What does this passage mainly tell us ?

A. Obama signed the 2010 Patient Protection and Affordable Care Act.

B. It is a practice to use multiple pens to sign important legislation in the USA.

C. Pens are necessary in the signature.

D. All the presidents like the multipen signature.

单项选择题