管内导线包括绝缘层在内的总截面积不应大于管子内面积的( )。
A．60%
B．50%
C．40%
D．30%
参考答案：C
读北京景观图，回答问题。
（1）图中反映的聚落类型是______________，这种聚落类型的房屋建筑特点是____________________ ，
居民主要从事_________________ 等工作。
（2）你认为北京在发展过程中，应如何对待传统民居——四合院？
_________________________________________________________________________________________
--The weather has been very hot and dry.
--Yes. If it had rained even a drop, things would be much better now! And my vegetables .
A．wouldn't die
B．didn't die
C．hadn't died
D．wouldn't have died
