Cure for Concrete

14. Which statement best expresses the main idea of paragraph 3?

• F Modern highways and bridges are often constructed with concrete.

• G Concrete was used by ancient Romans to build massive structures.

• H The demand for concrete has doubled in the last decade.

• J Concrete has been and continues to be an important building material.

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15. The information in paragraph 6 helps the reader understand that bioconcrete —

• A works best in areas affected by harsh weather conditions

• B is effective in repairing water damage

• C has a maximum weight that it can support

• D is limited to use in certain parts of the world

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16. How does the author organize paragraph 1?

• F By listing types of bacteria and then telling how they help fight diseases in the human body

• G By defining bacteria and then explaining how bacteria are used in some products

• H By stating a popular belief about bacteria and then disproving it with examples

• J By comparing good and bad bacteria and then describing how bacteria work

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17. What is the best summary of the article?

• A Concrete is a popular material, but it can develop cracks over time. Microbiologist Hendrik Jonkers believes that adding bacteria to concrete can help remedy this problem and

  provide savings for the construction industry.

• B Hendrik Jonkers, a Dutch microbiologist, noticed that concrete cracks over time. He decided to add bacteria to concrete to make a substance called bioconcrete. The bacteria are placed inside plastic capsules that are mixed into wet concrete.

• C A Dutch microbiologist named Hendrik Jonkers became interested in investigating how bacteria might be applied to concrete to fill cracks in concrete caused by water. He developed a self-healing bioconcrete that works to make concrete more durable.

• D Microbiologist Hendrik Jonkers wondered if concrete could repair itself in the same way that human bones do. He developed bioconcrete, which was used to build a lifeguard

  station near a lake in the Netherlands and repair an irrigation system in Ecuador.

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Read this sentence from paragraph 2.

When a bone breaks in the human body, it is

able to repair itself.

What is the most likely reason the author includes this information?

• F To advocate for more research concerning skeletal injuries

• G To suggest that bacteria could improve people’s health

• H To show the need for Jonkers’ research

• J To provide an example of the goal of Jonkers’ research

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