Rh血型有多少基因型？用5种抗血清可查出多少表型？
参考答案：根据Fisher－Race命名法，Rh血型有36种基因型，18种表型。
China is embarrassed by such a fact: Chinese visitors______ rubbish on the Great Wall, followed by a foreigner picking up the litter.
A．will drop
B．would drop
C．are dropping
D．had dropped
Java中，新建的线程调用start()方法，如mythread.start()，将使线程的状态从New (新建状态)转换为______。
