解析：选A。推理判断题。根据第四段Jamie Byng的讲话“Having one million books given to one million different people on one night in this way is first of its kind and greatly exciting”，可以判断类似这样的活动是以前没有发生过的。

　　40．Where can you most probably read this passage?

　　A．In a children’s book.

　　B．In the latest news.

　　C．In a health magazine.

　　D．In a scientist’s diary.

　　解析：选B。文章出处题。本文是一则关于世界图书之夜的资讯报道，故B为正确答案。

　　D

　　People who do not get enough vitamin A in their diet may develop night blindness.But in the developing world a lack (缺乏) of vitamin A causes much more serious harm to children.According to the WHO，as many as 25,000 children die every year because of a lack of vitamin A.

　　One excellent source of vitamin A is found in sweet potatoes with orange flesh (果肉)．Orange sweet potatoes contain high levels of beta-carotene (β-胡萝卜素)，which the body changes into vitamin A．Experts say orange sweet potatoes specially produced

　　because

　　of growing conditions in Africa could help solve the lack of vitamin A there.

　　But，first，more people will need to be persuaded to eat them.Jan Low says the sweet potato needs a better image in Africa.“We do have an image problem with the sweet potato in general in Africa.”

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