春暖花开这时有些人的皮肤红肿发痒，检查后医生告诉患者对花粉过敏了，根据所学的知识我们知道是人体的哪项免疫功能失常造成的（　　）

A．抵抗抗原的侵入，防止疾病的产生

B．清除体内衰老死亡和损伤的细胞

C．监视、识别、清除体内产生的异常细胞

D．其他原因

Canada is a country ________ many different nationalities as well as one with foreign immigrants __________ the majority of its population.

A．making up of; occupied with

B．consisting of; making up

C．made up of; consisting of

D．consisted of; taking up