皮皮学，免费搜题
登录
搜题
【单选题】
造成臭氧层空洞的主要原因是人类排放的 所引起的？A.
氟利昂
B.
二氧化碳
C.
颗粒物
D.
二氧化硫
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】创业基础课程实践,围绕( ),( ) ,( )主题进行。
【简答题】运用本单元所学技能,制作视频电子相册,主题自选,时长不限。
【多选题】What are the problems in the competition for international tourist market of China?
A.
Geographical location
B.
Fierce competition
C.
Quality of the tourist products
D.
Problems in sales and promotion
【简答题】The Summer Palace is one of the most popular tourist __________ in China. [A] scenes [B] seats [C] sights [D] sites
【简答题】According to a survey released by the Nielson Company on Thursday, China has become a global tourist attraction after the Beijing Olympics. The survey said the Olympics not only built up China’s image...
【单选题】( ) Which tourist area has always been a weak link in China's inbound tourist market.
A.
South Asia and Oceania
B.
Europe and Oceania
C.
Middle East and Africa
D.
Africa and America
相关题目：