Are you attending a computer training class? Or take part in the introduction as follows:

The correct one is the use of punctuation marks in the following sentences ()

A. Are you attending a computer training class? Or do you want to attend a theoretical physics class?

B. at the same time, it is also necessary to pay attention to exquisiteness in product packaging, trademarks, text and pictures in instructions.

C. The teacher said to his students, "We should make continuous progress in our studies, or we will retreat. As the old saying goes,' Learning is like sailing against the current, if we don't advance, we will retreat'."

D. was supposed to meet at two o'clock in the afternoon, but I waited for two or three hours before he came.

answer C

analysis a. the first question mark is changed to a comma. B. the first two pauses should be replaced by commas. D. you can't use a pause in the middle of the estimate.

The correct usage of punctuation marks is as follows:

1. Dot

The function of dot is to break, which mainly indicates pause and tone. It is divided into the dot at the end of the sentence and the dot in the sentence.

the dot at the end of a sentence: a dot used at the end of a sentence to indicate the pause at the end of the sentence and the mood of the sentence. Including periods, question marks and exclamation points.

in-sentence dot: used in a sentence to indicate various pauses in a sentence. Include comma, pause, semicolon and colon.

2. Labels

Labels are used to indicate the specific properties and functions of certain components (mainly words). Including quotation marks, brackets, dashes, ellipsis, bullets, hyphens, separators, book titles, proper names and separators.

3. Period

A kind of dot at the end of a sentence, which mainly indicates the declarative mood of the sentence. The form is "."

4. Question mark

A kind of dot at the end of a sentence, which mainly indicates the interrogative mood of the sentence. The form is "?" .

5. Exclamation point

One of the periods at the end of a sentence, which mainly indicates the exclamatory mood of the sentence. The form is "!" .

Used at the end of a sentence, it mainly expresses an exclamation tone, and sometimes it can also express a strong imperative mood and rhetorical tone. The use of exclamation marks is mainly based on the fact that there is a big pause before and after the paragraph, with exclamatory tone and intonation, or with strong imperative, rhetorical tone and intonation, and does not depend on the length of the sentence.

6. Comma

A kind of dot in a sentence, indicating a general pause in a sentence or paragraph. The form is ",".

a kind of dot in a sentence, which indicates a pause between juxtaposed words or after some ordinal words in a paragraph. The form is ",".

7. A semicolon

is a kind of dot in a sentence, which indicates the pause between clauses with parallel relationship in a complex sentence and the pause between the first-level clauses in multiple complex sentences with non-parallel relationship. The form is ";" .

8. Colon

A kind of dot in a sentence, indicating a pause in a paragraph that prompts the following or summarizes the above. The form is ":".

9, a kind of quotation mark

, indicating the content directly quoted in a paragraph or the components that need to be pointed out in particular. There are two forms of double quotation marks and single quotation marks. The left is the front quotation mark, and the right is the back quotation mark.

1. A kind of parenthesis

label, which indicates the content of comments, supplementary explanations or other sentences with specific meanings in a paragraph.

The main form is parentheses (), and other forms include square brackets [], hexagonal brackets [] and square brackets.

11. A kind of dash

label, which indicates the comments, supplementary explanations or phonetic and meaning changes of some components in a paragraph.

the form is "-".

12. Ellipsis

is a kind of label, which indicates the omission of some contents in a paragraph and the discontinuity of meaning. The form is "...".

13. bullet

is a kind of label that indicates some important words or words that need to be specified in a paragraph.