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