单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
What is the core for plants to use water

A．Carbon dioxide.
B．Chemical energy.
C．Molecule.
D．Proteins.

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. What is the core for plants to use water 您的浏览器不支持 audio 元素。