What do you know about the sea? Some people have seen it, but others haven't. The sea looks beautiful on a fine sunny day and it can be very rough when there is a strong wind. What other things do we know about it?

    Of course, the sea is very large. In the world there is more sea than land. If you swim in the sea, you know that the water is salty. Rivers take salt from the land into the sea. Some places of the sea are more salty than other places. Do you know the Dead Sea? Fish can't live in it!

对下面句中划线词的释义全部正确的一项是(   )

吸毒有害健康．下列哪项传染病可能通过吸毒者共用不洁注射器注射毒品而感染（  ）