People are not so much concerned about price in commodities like soybeans because______.
A. these commodities are not as urgently needed as oil
B. the price of these commodities are not as volatile as that of oil
C. the price rise of these commodities is not as easily felt as that of oil
D. these commodities are not as widely used as oil in daily life
据国外学者研究，蚊子、丸花蜂和蜻蜓这三种昆虫中，扇动翅膀频率最多的是哪种昆虫？
天气预报中，小雨是指24小时内降雨量在多少毫米以下？
The Nobel Prize winners are mentioned to illustrate that______.
A. age is actually an advantage for technological entrepreneurship
B. experience is one of the prerequisites for innovative ideas
C. the age of scientists winning Nobel Prize is older than it was a century ago
D. age can be an impetus rather than resistance to creative ideas
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