It seems that the aged people________the H7N9 more easily from the recent cases．
| A．pick up |
| B．mix up |
| C．set up |
| D．use up |
It seems that the aged people________the H7N9 more easily from the recent cases．
| A．pick up |
| B．mix up |
| C．set up |
| D．use up |
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