Research has shown that most preschool

A.don't use the words "think,"remember or pretend
c. believe that an event can be known without being directly observes.
D. often insist they've always known information they just learned

Major proofreading is needed here.

5+5=10

10+10=20

20+20=40

1+1=2

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To find the answer to this question, you can start by conducting a literature search on research studies related to preschool children and their language usage and cognitive development. Here are the steps you can follow:

1. Begin with a general internet search using suitable keywords such as "preschool children language development research," "preschoolers cognitive abilities," or "preschool children language usage."
2. Look for reliable sources, such as academic journals, scholarly articles, or books written by experts in the field.
3. Read through the abstracts or summaries of the articles to determine if they address the specific behaviors mentioned in the question.
4. If you find relevant sources, access the full-text of those articles and read them thoroughly.
5. Pay close attention to the methodology and findings of the studies, as well as any conclusions or recommendations made by the authors.

Based on the information you provided, options A, C, and D each present a statement regarding preschool children's behavior. To find which statement is supported by research, you will need to examine the findings and conclusions from your literature search.

Remember, it is important to critically evaluate the sources you find, as well as consider the context and limitations of the research studies you come across.