The dining room is clean and tidy, with a table already ______for a big meal．

A．being laid

B．laying

C．to lay

D．laid

从中国年降水量分布图上可以看出，800毫米降水量线大致沿____________—秦岭—________东南边缘一线；400毫米等降水量线大致沿________—_______—兰州—________—___________东南端一线。