DiGeorge综合征属于
A．B细胞缺陷病
B．T细胞缺陷病
C．联合免疫缺陷病
D．吞噬细胞缺陷病
E．补体缺陷病
参考答案：B
The poem _____ in tomorrow' s literature class is from a collection of classic works. [ ]
A. to be recited
B. to recite
C. be recited
D. being recited
吸气性呼吸困难一定存在上呼吸道梗阻，对吗，为什么？
