问题 选择题

如图表示的是身边一些物质在常温时的近似pH.下列叙述不正确的是(  )

A.草木灰水呈碱性

B.鸡蛋清呈碱性

C.橘子汁的酸性比萝卜汁的酸性弱

D.柠檬汁能使紫色石蕊溶液变红

答案

A、草木灰水的pH大于7,呈碱性.故A正确;

B、鸡蛋清的pH大于7,显碱性,故B正确;

C、萝卜汁、橘子汁的pH都小于7,显酸性,但橘子汁的pH小于萝卜汁的pH,酸性比萝卜汁强.故C错误;

D、柠檬汁的pH小于7,显酸性,能使紫色石蕊溶液变红.故D正确.

故选C.

阅读理解

阅读短文,选择正确答案。

Dear David,

       How are you? I'm fine, I'm in London, at the International School of English. I'm in Class 3 with eight

students. They're from different countries. Our teacher's name is Henry Birdcall. He's very nice. He's a very

good teacher.

       I'm living with an English family. Mr. and Mrs. Brown have three children. Thomas is fourteen, Catherine

is twelve, and Andrew is seven. They are all very friendly, but it isn't easy to understand (懂) them!

       London is very big and very interesting. The weather is good-cold but sunny and the parks are beautiful!

Hyde Park, Green Park, and St. James' Park are all in the city centre. English food is OK, but the coffee is

horrible (可怕)!

       Write to me soon. 

                                                                                                                                       Love 

                                                                                                                                       Paul

1. This letter is from ______. [ ]

A. David

B. Paul

C. Paul's teacher

D. Paul's classmate

2. The writer's class has _______. [ ]

A. eight students

B. nine students

C. eight girls

D. many students

3. The writer lives _______. [ ]

A. at school

B. in a hotel

C. with her classmates

D. at Mr. Brown's home

4. Hyde Park is _______.[ ]

A. in a school

B. in London

C. next to London

D. in Japan

5. _______ is not mentioned (提到) in the letter. [ ]

A. English food.

B. The writer's teacher

C. The writer's family

D. The weather in London

名词解释