问题 选择题

已知生活中一些食物的pH如下,其中显碱性的是

食物豆浆牛奶葡萄汁柠檬汁
pH7.4~7.96.3~6.63.5~4.52.4~3.0
A.豆浆      B.牛奶       C. 葡萄汁       D.柠檬汁

答案

答案:A

题目分析:根据溶液的酸碱性与pH值的关系分析,当溶液的pH等于7时,呈中性;当溶液的pH小于7时,呈酸性;当溶液的pH大于7时,呈碱性。

A、豆浆的pH为7.4~7.9,大于7,显碱性;

B、牛奶的pH为6.3~6.6,小于7,显酸性;

C、葡萄汁的pH为3.5~4.5,小于7,显酸性;

D、柠檬汁的pH为2.4~3.0,小于7,显酸性。故选A

点评:本题难度不大,理解和熟练掌握溶液的酸碱性和溶液pH大小之间的关系,是解答本题的关键。

阅读理解

Hot words on the Internet don’t stay hot for long. “Geili” and “fuyun”, last year’s biggest linguistic innovations, are practically prehistoric in Internet terms. What’s buzzing now is “hold steady”

The term comes from a segment (片段) on the Taiwanese TV show University which features Miss Lin(Xie Yilin) giving a lecture on how to behave like a fashion queen at parties or on the bus. The extremely funny lecture is mainly an over-the-top mockery(嘲笑) of the fashion world, but Miss Lin makes a point: We need to hold steady in pressure-filled or embarrassing situations.

Holding steady, Internet slang for “staying poised”, is one of the qualities the public has been looking for lately as pressures on marriage, work and money can easily drive people crazy. The quality was demonstrated by a girl named Su Miaoling this year. The contestant in the TV singing competition Super Girl carried herself with an air of confidence on stage and kept her cool when others got anxious. “I like your poise(淡定). Very few contestants on this stage can keep calm like you do,” said one of the show’s judges, Hu Haiquan, to Su. Internet users dubbed Su “Sister Poise”.

Poise is also appreciated in Western culture as an essential quality of a well-mannered person. Each year, the National League of Junior Cotillions of the US releases a list of the Ten Best Mannered People. Kate Middleton made it onto the list in 2011 “for the poise and dignity with which she conducts herself in the public spotlight”. The Duchess of Cambridge was also acclaimed earlier this year for her remarkable poise at the royal wedding.

Good news for many, poise is not genetic----it can be acquired with a bit of effort. A personal growth guidance gives tips on how to stay poised. “Take a few deep breaths when you are facing a situation that tests your patience; practice yoga regularly to calm your nerves; use self-affirmation by saying ‘I choose to be calm in any situation’; write down your affirmation daily to imprint the goal,” reads the site.

小题1:According to the passage, what does “hold steady” mean?

A.well balanced

B.hold still

C.remain stable

D.keep calm小题2:Which of the following statements is NOT true?

A.Poise isn’t born with people, so it can be acquired.

B.Under different pressures, people hope to keep calm.

C.“Hold steady” comes from a lecture given by a fashion queen.

D.In western culture, holding steady is a quality of well-mannered people.小题3:Which of the following is NOT the way to hold steady?

A.learn to use self-encouragement.

B.Write the goals to be achieved

C.Practice yoga regularly to calm your nerves.

D.Take deep breaths when facing difficult situations.小题4:The purpose of this passage is to_______.

A.introduce the Internet hot term “hold steady”

B.tell funny stories about how to hold steady

C.demonstrate how to keep calm under pressure

D.give advice on how to keep cool in daily life

单项选择题