【单选题】最适于检测抗原制品中的复合抗原的方法为
D.
Ouchterlonytests(双向免疫扩散)
【单选题】We used to swim in this lake, but now it is seriously ______.
【单选题】为了测量车辆的行驶速度,我们常常会发现交通警察手持雷达测速仪来监考过往车辆,雷达测速仪的原理是( )。
【单选题】My poor pet dog is seriously ill. I' m afraid it is ______ to die before long. [ ]