The World Health Organization expects a vaccine against H1N1 to be ________ by September or October this year．

1. A.
   accurate
2. B.
   available
3. C.
   affordable
4. D.
   alternative

The World Health Organization expects a vaccine against H1N1 to be ________ by September or October this year.

A．accurate B．available C．affordable D．alternative

 The World Health Organization expects a vaccine(疫苗)against H1N1 to be            by September or October this year.

    A．aggressive    B．available       C．absolute        D．abnormal