机体缺乏IgA易患（）
A.反复呼吸道感染
B.化脓性感染
C.革兰阴性细菌败血症
D.巨球蛋白血症
E.重链病
参考答案：A
—Remember this, children. ______ Careful you are, ______ mistakes you will make.
—We know, Miss Gao.
A. The more; the more
B. The fewer; the more
C. The more; the fewer
D. The less; the less
不开的给煤机应将开关手把打到“（）”。
