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回答下列各题：
B
Below is a selection from a popular science book.
If blood is red ,why are verns(静脉)blue?

Actually, veins are not blue at all. They are more of a clear, yellowish color. Although blood looks red when it’s outside the body, when it’s sitting in a vein near the surface of the skin, it’s more of a dark reddish purple color. At the right depth
But,in the long run, your brain probably tips it, because even when youre sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it . Why do teeth fall out, and
Baby (or “milk ”) teeth do not last long; they fall out to make room for bigger, stronger adult teeth later on. Adult teeth fall out when they become damaged, decayed and infected by bacteria. Once this second set of teeth has grown in, you’re done. Wh
Do old people shrink as they age? Yes and no. Many people do get shorter as they age. But, when they do, it isn’t because they’re shrinking all over. They simply lose height as their spine(脊柱) becomes shorter and more curved due
Because your brain gets confused between what you’re seeing and what you’re feeling. The brain senses that you’re spinning using special gravity-and motion-sensing organs in your inner ear, which work together with your eyes to keep your vision and bal
If exercise wears you out, how can it be good for you?
Because our bodies adapt to everything we do to them. And as far as your body is concerned, it’s “use it, or lose it”! It’s not that exercise makes you healthy; it’s more that a lack of exercise leaves your body weak and easily affected by disease.&nbs
A.Blue.
B.Light yellow.
C.Red
D.Dark reddish purple.

试题出自试卷《浙江2013年高考英语试题及参考答案》

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回答下列各题：
B
Below is a selection from a popular science book.
If blood is red ,why are verns(静脉)blue?

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回答下列各题：BBelow is a selection from a popular science book.If blood is red ,why are verns(静脉)blue?

回答下列各题：
B
Below is a selection from a popular science book.
If blood is red ,why are verns(静脉)blue?