下图中三条曲线分别代表了动物物种多样性程度、动物数量易变程度及冬眠动物比例在不同类型生态系统中的变化趁势。代表动物物种多样性程度和数量易变程度的曲线依次是（）

传播途径是指病原体离开____ 到达____ 所经过的途径。病原体传播的主要途径有：空气传播，____ 传播，____ 传播。

MY Travel Experience in China

    During the summer holidays I visited a variety of regions in China.

My first stop was Beijing and of course the Great Wall. Without question it lived up to my ____ (expect).

    After a long journey, I reached Yunnan. With____(it) minority villages and impressive landscapes, Yunnan had a lot to offer. One of my ____ (enjoy) moments in Yunnan was during my visit to The Tiger Leaping Gorge. The climb over the gorge was at times exhausting ____ always breathtaking. The views couldn't ____ (imagine) in their beauty and they ____ (leave) me with many great memories.

    After taking a boat from the mainland I arrived at ____ island province of Hainan. There I visited Baihua Waterfall. Floating on a pool of water at the base and looking up at the waterfall with a background of blue sky was one of the most ____ (relax) experiences of my life.

    Throughout China there are many ancient buildings and in particular ancient towns. Lijiang and Dali both have glorious ____ (example) of this. It was remarkable to step back in time and get an idea of____ China might have looked like all those years ago. I thought the buildings were beautiful and full of history.

    I had a wonderful time! China is both fascinating and beautiful!

下列说法错误的结论有（　　）

（1）相等的角是对顶角；（2）平面内两条直线的位置是相交，垂直，平行；（3）若∠A与B∠互补，则$\frac{1}{2}\angle A$与$\frac{1}{2}\angle B$互余，（4）同位角相等．