How is food for plants made Food for plants is made （）
A. from water
B. from the air in the sky
C. from the soil
D. from water, things in the soil and air and sunlight
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衡量计算机硬盘技术的指标很多，但不包括( )。
A. 主轴转速
B. 平均寻道时间
C. 地址总线宽度
D. 数据传输速率
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.
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
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