We're staying with Lingling's uncle in Hunan Province, and I'm having ____ (冠词) wonderful time here in Zhangjiajie. It's a magic land of mountains, forests and ____ (river). It's very large, about 480 square kilometres. It's famous  ____ (介词) the strange shape of its tall rocks. Some of them ____ (look) like humans while others look like wild animals. Last night we camped by a small lake. During the night, we____ (hear) a noise! It woke everybody up. We thought somebody  ____ (be) moving about. Lingling's uncle said it was an animal. We came out without  ____ (make) any noise, ____ (连词) found it was just a hungry monkey looking for food. This morning, we climbed Mount Tianzi! From the top we hoped to see the lakes and forests. But it was a pity that it was____ (cloud). We could only see the mountain tops above the clouds. Tomorrow we're going to Dongting Lake, ____ (冠词) second-largest freshwater lake in China. We'll be back home next week! Wish you were here.

如图是血涂片在显微镜下的一个视野图．

（1）当人被细菌感染而发炎时，图中____ 的细胞数目会显著增加．

（2）当我们不慎摔倒使手掌皮肤出血，过一段时间皮肤表面就结了血痂，是因为图中____ ____具有止血和加速凝血功能．

（3）当图中____ 数量过少或其中血红蛋白含量过低时，会造成____ ，应多吃一些含蛋白和含____ 的食物．

（4）某病人必须进行大量输血抢救的时候，应以输____ 血为原则，否则，若血型不对，会使受血者体内的A____ 凝聚成团阻碍血液循环造成危险．