问题 选择题

根据金属活动性顺序分析,下列描述或判断正确的是

A.金属钾能与硫酸锌溶液发生化学反应得到金属锌

B.金属铁与硫酸溶液反应后所得溶液的质量比原溶液的质量增大

C.在常温下,铝比镁更容易与氧气发生化学反应

D.金属铜与氯化银反应得到金属银

答案

答案:B

金属钾的化学性质活泼会与水反应所以不能从硫酸锌溶液中置换出金属锌,A错误;金属铁与硫酸反应生成氢气和硫酸亚铁,根据化学方程式可以知道没有56g的铁会置换出2g的氢气溶液的质量增大了54g,B正确;金属活动性顺序中镁在铝的前面所以镁比铝更容易和氧气反应,C错误;前面的金属单质只能从后面金属的盐溶液中置换出该金属,氯化银难溶于水所以铜不能从氯化银中置换出银,D错误;所以答案选B。

单项选择题 A1/A2型题
阅读理解

阅读理解。

     Kimchi traditionally has a rosy color. Korea.net says: "The color red wards off (避开) evil spirits. The

color represents the spirit of the Korean people and kimchi is more than just a food. It's a culture."

     A meal without kimchi is unthinkable. So what is kimchi?

     Joan Raymond, food writer for US website health.com, writes: "It's a reddish, fermented (发酵的)

cabbage dish , made with a mix of garlic salt, vinegar, chili peppers and other spices.

    It is served at every meal, either along with or mixed with rice and noodles. It is part of a high-fiber, low

fat diet, which has kept obesity (肥胖) at bay."

     Kimchi is used in everything from soups to pancakes and as a topping (配料) on pizza and burgers.

     Health.com named kimchi in its list of the world's top five healthiest foods as it is rich in vitamins, aids

digestion and may even reduce the risk of cancer.

     A study conducted by Seoul National University claimed that chickens infected with the H5N1 virus

(bird flu) recovered after eating food containing the same bacteria found in kimchi.

     When Koreans pose for photos, they say "kimchi", instead of "cheese".

1. According to the article, which of the following statements is TRUE?

A. Kimchi contains something that can kill the H5N1 virus.

B. Kimchi is rated as the healthiest food in the world.

C. Kimchi is a cultural treasure for Koreans.

D. Each person eats 40 pounds of kimchi per month.

2. What does the underlined phrase "keep... at bay" mean?

A. predict

B. prevent 

C. overcome

D. develop

3. What does the article mainly talk about?

A. The nutritional value of kimchi.

B. Ways of making kimchi.

C. The origin of kimchi.

D. Kimchi and what it means to Koreans.