【2013山东泰安】The food safety is a serious_______ in our country. We should try to solve it.
| A．subject | B．program |
| C．problem | D．opinion |
【2013山东泰安】The food safety is a serious_______ in our country. We should try to solve it.
| A．subject | B．program |
| C．problem | D．opinion |
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