新建管道与已建管道连接时，必须先核查已建管道接口高程及平面位置后方可（）。
参考答案：开挖
图15是“某城市规划简图”，该市常年盛行东北风。该城市各功能区布局合理，读图回答下列问题。（7分）
(1)将图15中的三个符号与其相对应的工业污染类型用线段连接起来。（3分）
(2)在图16的曲线中，能与图15中“A→B”沿线地租变化情况相吻合的是 ▲ 图。（1分）
(3)图15中图例①②表示的城市功能区分别是① ▲ 、② ▲ 。（2分）
(4)该城市的a、b、c、d四个地块中适宜建设高级住宅区的是 ▲ 。（1分）
句型转换(每空一词)。
1. To understand their accents is really difficult. (用it作形式主语改写句子)
______ ______ really difficult ______ ______ their accents.
2. Jay is a singer and he is also an actor. (改为同义句)
Jay is ______ ______ a singer ______ ______ an actor.
3. You can find shops here and there in this street. (改为同义句)
Shops can _______ ______ ______ in this street.
4. The teacher suggested walking there. (对划线部分提问)
What ______ the teacher ______ ______?
5. He gave away the old computer. (对划线部分提问)
What did he ______ ______ the old computer?
he is also an actor. (改为同义句)