出生缺陷是由于遗传因素或环境因素的影响所致。
参考答案：对
根据域名代码规定，表示教育机构网站的域名代码是______。
A) net B) corn C) edu D) org
In our university there are several big parks ____we students can go to enjoy the beautiful scenery．
A．to which
B．at which
C．from which
D．in which
