问题 选择题

下列说法不正确的是(  )

A.分子、原子、离子都可以直接构成物质

B.元素间的本质区别是质子数的不同

C.决定原子质量大小的主要是质子和电子

D.保持水的化学性质的粒子是水分子

答案

A、分子、原子、离子都可以直接构成物质,且物质由哪种粒子直接构成,就有哪种粒子保持它的化学性质,所以正确.

B、元素是指具有相同的质子数(或核电荷数)的一类原子的总称,元素之间的本质区别是质子数或核电荷数不同,所以正确.

C、原子的质量主要集中在原子核上,原子核是由质子和中子构成的,每个质子的质量与每个中子的质量相近,原子的质量应是由质子和中子共同决定的,所以错误.

D、水是由水分子直接构成的,物质由哪种粒子直接构成,就有哪种粒子保持它的化学性质,所以正确.

故选C.

单项选择题
阅读理解

阅读理解。

     阅读下面的短文,并根据要求答题。(请注意问题后的字数要求)。

【1】It seems like everyone has a blog these clays. To make it a popular website,there are a few

general guidelines you should follow to increase your chances of success.

【2】Write about what you know,and stick to one topic for a while. If you write without checking

facts or with no experience behind your articles. people won't believe it and won't come back to

your site. Similarly,if you write about too many different topics,you won't be able to build up an

audience of readers as easily.

【3】The first thing students are taught as early as grade school about evaluating websites is that

if there are a bunch of grammatical errors,the website probably isn't credible(可信的).This means

that you need to check every single post you write before you put it up on your site. It's a good idea

to write something,leave it sit for a while,and then come back to read it over before you post it. This

gives you flesh eyes to catch mistakes.

【4】Keeping a schedule of posts can help you not disappoint your readers,because they will start

to come back to your site regularly to see what's new. It's a good idea to set a goal for yourself and

keep it,which is important to keep your readers coming back for more.

【5】Knowing how search engines like Google or Bing find your site can help your posts show up

higher on Internet searches and,therefore,get you more clicks to your site.

【6】Websites now are so advanced in their graphic design that the way a website looks can point

to its credibility just as much as being error-free. Choose a clean theme for your blog,the easier the

site is to read,_________.

1. What is the author's purpose of writing this passage? (no more than 10 words)

__________________________________________________________________________

2. What makes your blog credible? (no more than 9 words)

①______________________②______________________③_______________________

3. Fill in the blank in Paragraph 6 with proper words.(no more than 8 words)

__________________________________________________________________________

4. Why should one keep a schedule to write often for his blog? (no more than 15 words)

_________________________________________________________________________

_________________________________________________________________________

5. Translate the underlined sentence in Paragraph 2 into Chinese.

__________________________________________________________________________

_________________________________________________________________________