【单选题】听力原文:Shall we aim to finish by four-thirty? (A) Are they Finnish? I thought they were Swedish. (B) There'll be six of us. (C) That sounds good. (39)
【简答题】Modern methods —— tracking polar bear populations have been employed only since the mid-1980s, and are expensive to perform consistently over a large area. 2、Of —— nine recognized polar be...