说明理由
1.The queen been appears _____ well in the comb built by the diligent worker beens.
A.to nurse B.to be nursed C.to have nursed D.being nursed
2.Any country which ______ not or will not pay due attention on the environmental protection is not entitled to the world club membership.
A.must B.should C.can D.might
3.The threats to thealth of astronauts in space are very different from ______ on earth.
A.ones B.that C.it D.those