简述信息匮乏的后果。
参考答案:
(1)阻碍社会发展,导致经济停滞;
(2)导致科技落后,民族处于愚昧状态;
(3)导致文化素质下降;
(4)不良信息乘机而入。
I would like _____ you to my birthday party, but I was busy and forgot to call you. [ ]
A. to invite
B. inviting
C. to have invited
D. having invited
下列哪项不是紫外线的作用()。
A.色素沉着作用
B.杀菌作用
C.红斑作用
D.抗佝偻病作用
E.镇静作用