China began to open to the outside world in the late 1970s. _________, there have been great changes in the country.
语言运用。
从下列五个词中任选3个写一段50个字左右的文字。
执拗 深邃 憔悴 消逝 迷惘。
蓝藻、硫细菌、硝化细菌等,能够利用光能或化学能将无机物转变为储能的有机物满足自身对营养物质的需要。如这些自养型微生物属于( )