The industry is to the national economy. It is expected to account for 38.4% of our country's GDP by 2015.
| A．valuable | B．vague | C．vital | D．valid |
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The industry is to the national economy. It is expected to account for 38.4% of our country's GDP by 2015.
| A．valuable | B．vague | C．vital | D．valid |
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