Some car makers have already tested these nano­cellulose plastics and scientists have predicted the plastics would be in use within two years，mainly for bodies for cars.

　　16．The underlined word “reinforce”in

　　the first paragraph is closest in meaning to“________”．

　　A．take the place of

　　B．make something stronger

　　C．increase the percentage of

　　D．get rid of

　　17．Which of the following statements about the nano­sized fruit fiber is TRUE?

　　A．It is used to make bulletproof vests.

　　B．It is used to replace steel and aluminum automotive parts.

　　C．It can resist damage from heat，water or oxygen.

　　D．Leao thinks it is better than nano­cellulose from wood.

　　18．According to the article，which of the following is the correct order that researchers produced super­strong，lightweight plastics?

　　a．put pineapple leaves and stems into a device similar to a pressure cooker

　　b．a powder is formed

　　c．add some powders to the plastics

　　d．add certain chemicals and heat the mixture over several cycles

　　A．b，c，a，d

　　B．a，b，c，d

　　C．b，a，c，d

　　D．a，d，b，c

　　19．We can conclude from the article that nano­cellulose________.

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