[多选题]现有一用户希望把自己手机中正在播放的内容投到客厅电视上观看，以下说法正确的是（ ）
A.机顶盒需要安装手机投屏盒端apk
B.如果用户使用的手机是安卓系统，该手机需要安装一个投屏APP；
C.如果用户使用的手机是苹果系统，该手机无需安装投屏APP
D.投屏时，安卓手机与机顶盒之间采用的是DLNA协议；苹果手机与机顶盒之间采用的是AirPlay协议

During the 1980s, unemployment and underemployment in some countries was as high as 90 percent. Some countries did not (21) enough food; basic needs in housing and clothing were not (22) . Many of these countries looked to the industrial processes of the developed countries (23) solutions.
(24) , problems cannot always be solved by copying the industrialized countries. Industry in the developed countries is highly automated and very (25) . It provides fewer jobs than labor-intensive industrial processes, and highly (26) workers are needed to (27) and repair the equipment. These workers must be trained (28) many countries do not have the necessary training institutions. Thus, the (29) of importing industry becomes higher. Students must be sent abroad to (30) vocational and professional training. (31) , just to begin training, the students must (32) learn English, French, German, or Japanese. The students then spend many years abroad, and (33) do not return home.
Al
A. expensive
B. mechanical
C. flourishing
D. complicated

Business and government leaders also consider the inflation rate to be an important general indicator. Inflation is a period of increased spending that causes rapid rises in prices. (51) your money buys fewer goods so that you get (52) for the same amount of money as before, inflation is the problem. There is a general rise (53) the price of goods and services. Your money buys less. Sometimes people describe inflation as a time when "a dollar is not worth a dollar anymore".
Inflation is a problem for all consumers. People who live on a fixed income are hurt the (54) . Retired people, for instance, cannot count on an increase in income as prices rise. Elderly people who do not work face serious problems in stretching their incomes to (55) their needs in time of inflation. Retirement income (56) any fixed income usually does not rise as fast as pri
A. meet
B. obtain
C. care
D. acquire