根据短文内容判断下列句子正误。

    There is a zoo near our village．There is a forest in the zoo．There are many animals in the forest．Look! There is a tiger．It's running．Some birds are in the trees．They are singing．Here comes a bear．It's walking．Oh! Look at the monkeys．They are climbing trees．How cute they are! And some rabbits are playing with each other under a big tree．

如图，在△ABC中，AB=AC，P是△ABC内的一点，且∠APB＞∠APC，求证：PB＜PC（反证法）

读我国四大地理区域图，与①、③两大地理区域分界线大致吻合的是(    )

 对于化学反应：4P+5O₂2P₂O₅，下列说法正确的是（　　）

①参加反应的物质是磷和氧气 ②反应前后分子总数不变 ③反应前后元素的种类不变

④反应前后原子的种类和数目不变 ⑤反应前后物质的总质量不变 ⑥反应前后元素的化合价不变．