问题
单项选择题 A1/A2型题
0.5～1岁婴儿推荐钙的AI值是（）。
A.300mg/d
B.400mg/d
C.600mg/d
D.800mg/d
E.1000mg/d
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
0.5～1岁婴儿推荐钙的AI值是（）。
A.300mg/d
B.400mg/d
C.600mg/d
D.800mg/d
E.1000mg/d
参考答案：B
People often call the plastic bags “white pollution”. 小题1:, it becomes the worst invention for the human. It is reported that it takes 100–200 years to break down the plastic bags completely. However, a 16-year-old high-school Canadian student called Daniel Byrd discovered the way to break down the plastic bags! The idea of the invention comes from his housework. 小题2: . Every time, when he opens the closet, the plastic bags fly out. This makes him very angry. 小题3: . With his teacher’s help, he found that when he put the two germs（细菌） mixture up and that made the plastic bags break down quickly. He made an experiment first. He put some earth germs and plastic bags together. After 12 weeks, he found the plastic bags had been broken down. 小题4: . The experiment also showed that the plastic bags could be broken down in three months. And they only gave out some water and little carbon dioxide (CO2). Now Byrd has got 30 thousand dollars from his invention. 小题5:. He has also got a lot of award from many universities.
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