How does everything living on earth live（）
A. Each plant can live alone.
B. Each animal can live alone.
C. Everything living on earth cannot live without needing other living things.
D. If living things want to live they must kill each other.
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A suitable title for the articles is （）
A. Dangerous Sports--What and Why
B. The Boredom of Modem Life
C. Bungee Jumping--Is It Really Dangerous
D. The Need for Excitement
急性出血量多少时应立即输血
A. 200～400ml
B. 400～600ml
C. 600～800ml
D. 800～1000ml
E. ＞1000ml
Which living things can use sun energy directly（）
Animals.
B. Plants.
C. Both animals and plants.
D. All living things.
将计算机应用于办公自动化属于计算机应用领域中的( )。
A. 科学计算
B. 信息处理
C. 过程控制
D. 计算机辅助
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