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问题 不定项选择题

将含a mol Na2SO3的溶液与含b mol Na2S的溶液混合后，无明显现象；若再加稀硫酸，则立即出现黄色沉淀并有能使品红褪色的气体产生，则a与b的比值为[ ]

A．大于2

B．小于2

C．等于2

D．大于1/2

答案

答案：D

阅读理解
阅读下面短文，根据上下文，从文后方框内选出适当的选项填人文中空白处，使短文内容完整正确，然后完成第5小题。
     Years ago, if a teenager (青少年) had some problems in her life, she might write in her diary. Now
a teenager with the same problems might go onto the Internet and write about them in a blog (博客).
In many ways, a dairy and a blog are almost the same. So, what makes a blog different from a diary?
     __1__ Usually, a teenager treats her diary like a book full of secrets. Both diaries and blogs tell what
happened to the writer that day.
     I have a little sister, and sometimes l go online to read her blog. She writes about things like waking
up early for swimming practice and not studying enough for her chemistry exam. __2__ Then, after
I finished writing, I would hide my diary in a secret place because I was worried that my sister might
read it!
     Because a blog is such a public way of writing, it has both good and bad points. __3__ If I am
angry with a friend during school and write something bad about her in my dairy, she will never know.
However, if my sister writes something bad about a friend, that friend may read her blog and get angry.
__4__
     A blog has good points, of course. People choose to write in blogs because they know that their
friends will read what they write. If I am feeling sad one day and write in my dairy, "No- body cares
about me", no one will know about it. However, if my sister writes the same words in her blog, her
best friends will quickly reply and tell her how much they like her.  Blogs help people stay in contact
(联系) with their friends and know what the people around them are doing.
If people are careful about what they write, blogs are a very good way to write about everyday life.
However, I still prefer my old diary!
A. So we have to be very careful of what we write.
B. When I was her age, I wrote about the same thing, but only in my diary.
C. The biggest problem with a blog is that anyone can read what you write.
D. The biggest difference is that a blog is much more public than a diary.
5. Which one is NOT the writer's idea?
A. A dairy is safer than a blog.
B. A dairy and a blog are almost the same in many ways.
C. Blogs can help people stay in contact with their friends.
D. Blogs are the best way to write about everyday life.
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名词解释

co-translational translocation (共翻译转运)
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