题目提问,原文指出artificial leaf carries out which chemical process, 人造的叶子进行了什么的化学反应。对应到原文line 21-23:Current from the silicon solar water is fed to the catalysts, which split water molecules: Oxygen bubbles off the catalyst on one side of the water, while hydrogen rises from the catalyst on the wafer’s other side. 所以选择A:it splits water into hydrogen and oxygen。
B选项的splits carbon dioxide,不符合。
C选项的combine,不符合,
D选项的combines,不符合。
注:题目来源来自网络