园林树木枝叶的生长和根系的生长有相关性，所以树木枝叶旺盛的一侧，其根系的相应一侧一般也粗壮.
参考答案：对
–Jane called to say that she couldn’t come to your birthday party this Saturday night.
–______ David has been expecting to see her for ages.
A．What a shame!
B．How could she do that?
C．That’s terrible!
D．I don’t care.
由于氟碳表面活性剂的加入可改善蛋白泡沫的流动性、抗油流动性，因此可与干粉灭火剂联合使用.
