欧洲早期殖民活动的主要对象不包括[ ]
A.非洲
B.北美
C.印度
D.印度尼西亚
答案:A
So difficult _____ it to live in an English-speaking country that I determined to learn English well. [ ]
A. I did feel
B. did I feel
C. I have felt
D. have I felt
下列哪项不宜作为哮喘的预防措施()
A.给予酮替芬
B.给予色甘酸钠
C.免疫治疗
D.给予支气管扩张剂
E.激素吸入疗法至少维持6个月至2年