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【单选题】
机体的免疫防御功能低下时，容易发生哪类疾病？A.
反复感染
B.
自身免疫病
C.
过敏性疾病
D.
肿瘤
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【简答题】简述红细胞的生理特性、生成所需原料及其调节。
【简答题】红细胞的生理特性有哪些？
【简答题】It does not have to be January 1 st to give yourself a chance to make the most out of your day. Every day is a new day and a fresh start to learn, grow, develop your strengths, free yourself from past...
【单选题】Which does not belong to the scientific breakthroughs in the 21st century? 查看材料
A.
We'll know whom we are.
B.
We'll live longer.
C.
We'll conquer cancer.
D.
We'll manage Earth.
【简答题】It does not have to be January 1st to give yourself a chance to make the most out of your day — and your life. Every day is a new day and a fresh start to learn, grow, develop your strengths, heal you...
【单选题】Actually, the date for entry into effect will be 1st February（）.Though the text does not tell us about it.
A.
1995
B.
1998
C.
1999
D.
2000
【单选题】Which of the following does NOT contribute to the emergence of a new class of farmers?
A.
Strong desire for country life.
B.
Longing for greater wealth.
C.
Influence of TV productions.
D.
Enthusiasm for quality food business.
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