问题
单项选择题
太阳能量来源于（）
A.核裂变
B.核聚变
C.其它恒星
D.银河系中心
答案
参考答案：B
解析：
太阳辐射的巨大能量来自太阳内部的氢核聚变，由4个氢原子聚变成1个核原子，故选B。
考点：本题考查太阳能量的来源。
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太阳能量来源于（）
A.核裂变
B.核聚变
C.其它恒星
D.银河系中心
参考答案：B
解析：
太阳辐射的巨大能量来自太阳内部的氢核聚变，由4个氢原子聚变成1个核原子，故选B。
考点：本题考查太阳能量的来源。
How many plastic bags do you use every day? 46 there any chance for us to live without them? What can we do to have 47 plastic pollution? A performance in Hangzhou makes people 48 more about the overuse of plastic bags in our lives. In front of a supermarket in Hangzhou , five volunteers 49 white plastic bags and walked around and through the crowd. The performance 50 people to use more cloth bags 51 plastic ones. Some of the plastic bags worn by the performers were collected from customers in two food markets and 52 were collected by 700 students from a middle school. On that day, when leaving the food markets, customers were told to hand over 53 plastic shopping bags. 54 plastic bags were collected in two hours. “ If we do 55 about it, the earth will be eaten up by white pollution. And 56 will become ‘plastic men’,”said one of the performers. “How can you breathe in 57 plastic bags?” A 58 woman asked one performer.“How can the earth breathe 59 there are too many plastic bags?”the performer answered. Starting in June 2008,plastic bags were 60 given for free in supermarkets,shopping malls or food markets all over the country. People are called on﹙号召﹚to use cloth bags when they go shopping.
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