问题 选择题

常温下,在溶液中可以发生反应:X  +  2Y3+ ="=" X2+ + 2Y2+,则下列解释正确的是

①X被氧化   ②X是氧化剂  ③X具有还原性 ④Y2+是氧化产物  ⑤Y2+具有还原性 

⑥Y3+ 的氧化性比X2+

A.②⑤

B.②④⑥

C.①③④

D.①③⑤⑥

答案

答案:D

X的化合价升高,被氧化,作还原剂,X2+是氧化产物。Y元素的化合价降低,被还原,作氧化剂,Y2+是还原产物。在氧化还原反应中,氧化剂的氧化性大于氧化产物的,还原剂的还原性大于还原产物的,所以正确的答案是D。

完形填空

Every year, thousands of students choose to study in another country for a term, or a year. Studying overseas can be an exciting experience for many people.

Why do it

Living in another country can help you to learn another language, and

about another culture. You will see the world in a new way, and learn more

about yourself. Overseas study may also look good on your future resume

(求职简历). Many companies today want employees who speak a second language, or have experiences living or working in another country.

Making the right choice

Once you decided to study overseas, you have to make some choices. To choose the right

country or school, ask yourself: Where do I want to go and why? How much do I want to pay? How

long do I want to study abroad? Do I want to live with roommates, alone or somewhere else?

Getting ready to go

Get your passport and visa early! Before you go, learn some of the language, and read about

some common customs in the country that you are going to. Learn about the money. Bring some of it and a credit card with you.

Once you are there

After the first few weeks overseas, many students will feel a little homesick. They may miss their family, friends, and familiar ways of doing things. Remember that it takes time to get used to a new place, school and culture. When you feel sad or homesick, try to talk to others, or write your feelings in a notebook.

小题1:Studying overseas can bring many people an exciting experience.

小题2:The experiences of living or working in another country can help you find a good job.

小题3:If you decide to study abroad, you should make the right choice first.

小题4:You have to get a passport and visa after you go abroad and learn English well.

小题5: Try to talk to your parents or return home when you feel sad or homesick.

单项选择题