现代汉语、古代汉语属于语言学中的哪一门学科？
参考答案：
共时语言学
________ by the advances in technology, many farmers have set up wind farms on their land.[ ]
A．Being encouraged
B．Encouraging
C．Encouraged
D．Having encouraged
简述胚胎干细胞与疾病治疗。
