题目内容:
Accordingtothefifthparagraph,underwhatconditionsarealgaeabletousesolarenergytomakehydrogen?_______A Whenthereisalotofoxygenintheair.
B Whenthereisnooxygenintheair.
C Whenphotosynthesisistakingplace.
D Whenenoughstarchisstored.
参考答案:
答案解析: