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a group of two or more atoms that form the smallest identifiable unit through chemical bonds

A. atom

B. element

C. compound

D. molecule

. Why does the author compare space exploration to the Lewis and Clark journey?

A. to describe how the explorations were different

B. to give an example of earlier space explorations

C. to show that explorations are dangerous

D. to demonstrate the idea that space exploration brings opportunities

What is the meaning of ‘track’ in the context of the text?

A. A rough path or road, usually one that has not been built but that has been made by people walking there

B. Causing destruction or damage

C. Very large, heavy and solid

D. Material in a nuclear reactor that absorbs radiation

If you touch fire

A. You will get burnt

B. You get burnt

C. You got burnt

D. You are getting burnt