题目

Listen and write down the sentences. 答案：【1】This is why he was late for school again.9．读图回答问题：（1）黄河发源于青藏高原的巴颜喀拉山，流入渤海；（2）黄河上、中游的分界①是河口，中、下游的分界②是桃花峪；（3）黄河泥沙来自中游的黄土高原；（4）③是河套平原，④是宁夏平原．