Some poison (有毒物) in the sea is also 43 to them. It is time for us to help these lovely birds if we want to see them in the future. 34.A.be B.is C.are D.am 35.A.they B.their C.them D.theirs 36.A.to see B.see C.seeing D.sees 37.A.swimming B.swims C.swim D...