_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.

_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.

A．While            B．Unless            C．When            D．Because

_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.

1. A.
   While
2. B.
   Unless
3. C.
   When
4. D.
   Because

_________ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.

A. While      B. Unless    C. When        D. Because