我国地大物博,分为四大区域,对四大区域的有关叙述正确的是( )
A:甲图为西北地区,突出的自然特征是干旱,多发展绿洲农业
B:乙图为南方地区,突出的自然特征是全年高温多雨,主要农作物为水稻
C:丙图为北方地区,突出的自然地理特征是高寒,多发展灌溉农业。
D:丁图为青藏地区,突出的自然地理特征是高寒,多发展绿洲农业
计算2a-2(a+1)的结果是( )
如图为“长江流域示意图”,读图,完成下列内容。
下列为我国地势第二、三级阶梯分界线的是( )
Here are some facts about homes in the United States and the people who live in them. In the early 1990s, about 50% of the Americans own their homes and the rest rent(租) their homes. The rented homes are usually apartments(公寓). 74% of the people in the US make their homes in or around cities. 26% live in the country. Dogs live in about 40% of all homes in the US. About half that number have cats. Families in the US are becoming smaller. On the average(平均),2.64 people lived in a home in the early 1990s. In 1960, the average was 3.5. Half of the teenagers in the US have their own bedrooms. An American moves, on the average,twelve times in his or her life. In Japan, a person moves about five times, and in England a person moves eight times.