侏儒症
A．垂体前叶功能亢进B．垂体前叶功能减退C．垂体后叶功能减退D．甲状腺功能减退E．肾上腺皮质功能减退
参考答案：B
_______ plastic bags we use,_______ it will be to our environment.
A. The less; the better
B. The fewer; the better
C. The fewer, the worse
当拖飞机时，必须：
A、关闭APU
B、关闭NWS
C、打开APU
D、打开NWS
