．下列属于南半球反气旋的是
．D
反气旋中心气压为高压，地转偏向力在南半球向左偏，因此南半球反气旋为逆时针旋转辐散。
A．(A) The director has already signed the agreement.
B．(B) The director has read the agreement for three times.
C．(C) The director is not in and cannot sign the agreement.
D．(D) The director is not ready to sign the agreement.
完成下面有关免疫的概念图。
①（）②（）③（）④（）⑤（）⑥（）⑦（）⑧（）;
