2009职称英语真题理工类B级真题：阅读理解_职称英语考试真题理工类

A Right B　Wrong C Not mentioned

17　The radiocarbon dating technique is only about 40 years old

A Right B　Wrong C Not mentioned

18　An atom of ordinary carbon has six protons and eight neutrons

A Right B　Wrong C Not mentioned

19　Radar is used to determine the characteristics of radiocarbon

A Right B　Wrong C Not mentioned

20　Radiocarbon is reliable in dating an object back to at least 50，000 years.

A Right B　Wrong C Not mentioned

21　The C-14 in an organism begins to decay when it dies

A Right B　Wrong C Not mentioned

22　The half-life of C-14 is about 25，000 years.

A Right B　Wrong C Not mentioned

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