中度精神发育迟滞的IQ值范围为（）。
A．55～69
B．45~59
C．35~49
D．25～39
E．<25
参考答案：C
（2分）中国新建发射卫星发射基地位于海南省文昌市，原因是： 。
The pilot asked all the passengers on board to remain _________ as the plane was making a landing.
A．seat
B．seating
C．seated
D．to be seating
