大气透明度是指太阳辐射透过大气的程度。读我国大气透明度空间分布示意图，影响其分布差异的最主要因素是（）
A．气温
B．地势
C．土壤
D．植被
参考答案：B
解析：
根据我国大气透明度空间分布示意图分布特点，我国大气透明度大的地区主要在青藏高原上，大气透明度低的地区主要东部平原地区，因而影响其分布差异的最主要因素是地势。
考点：该题考查中国地理和空间分布图的判断。
| 根据方框内所给的词的正确词性填空。 | |
2. We were shocked by the _____ made by the mayor that all the gas supplies would be examined. 3. Only ticket-holders will be _____ into the stadium. 4. The government has began to make the _____ into the pollution of the river 5. The actress is so _____ that everyone present paid attention to her. 6. The hotel is right in the _____ of the town and you will not miss it. 7. I fell in love with the book the moment I read it because it is full of _____stories about his childhood. 8. He owes money to a list of people as _____ as your arm. 9. Over 150 _____ will compete in the Indoor Championships at the stadium. 10. Many of the nations of southeast Asia will one day be as _____ as Japan or South Korea. |