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1 |
According to paragraph 2, which of the following is a reagent? |
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| A. | cola drinks | | B. | onion juice | | C. | baking soda | | D. | iodine vapor |
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2 |
According to paragraph 2, what is the main advantage of using natural products to make invisible ink? |
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| A. | Natural products may be safer than chemicals. | | B. | Natural products are easier to mix than chemicals. | | C. | Natural products dry more quickly than chemicals. | | D. | Natural products print more clearly than chemicals. |
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3 |
Based on paragraph 4, why is a paintbrush a good tool to use to write a message? |
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| A. | It makes the ink dry faster. | | B. | It helps keep the message secret. | | C. | It makes the message seem like a picture. | | D. | It is easier to find than most other tools. |
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4 |
In paragraph 8, why is one sentence in bold print? |
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| A. | It starts a new paragraph. | | B. | It is an important warning. | | C. | It defines an unfamiliar term. | | D. | It is something that a person said. |
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5 |
Based on paragraph 10, why should a message writer avoid sending blank pages that contain an invisible message? |
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| A. | The blank pages will not heat well. | | B. | The blank pages will seem suspicious. | | C. | The blank pages will not show the ink. | | D. | The blank pages will be harder to send. |
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