问题
选择题
如果人体缺乏维生素A，可能会引发（ ）
A．佝偻病
B．脚气病
C．坏血病
D．夜盲症
答案
A、维生素D会影响人体对钙的吸收，会患佝偻病或骨质疏松，所以错误．
B、维生素B缺乏会患脚气病，所以错误．
C、维生素C缺乏会患坏血症，所以错误．
D、维生素A缺乏使从患夜盲症，所以正确．
故选；D．
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如果人体缺乏维生素A，可能会引发（ ）
A．佝偻病
B．脚气病
C．坏血病
D．夜盲症
A、维生素D会影响人体对钙的吸收，会患佝偻病或骨质疏松，所以错误．
B、维生素B缺乏会患脚气病，所以错误．
C、维生素C缺乏会患坏血症，所以错误．
D、维生素A缺乏使从患夜盲症，所以正确．
故选；D．
As everyone knows, there are many 16 of transportation in the world, like bicycles, buses, ships, trains and 17 . If you are in big 18 like Shanghai or Beijing, maybe you get to school 19 a subway or you have to 20 to school because you live in a mountain village. Here I am just trying to say something about 21 . Ten years 22 , bicycles were very 23 in most villages. 24 family had one or two of bicycles. Children got to school by bicycle; 25 rode bicycles to go shopping. Then motorcycles (摩托车) 26 to become popular. People no longer rode bicycles because motorcycles ran 27 faster. But now, in some countries，bicycles are highly suggested 28 the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles 29 . So, to live a low-carbon life, 30 a bike is a good way.
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