单项选择题

Questions 28 and 29 are based on the following news. One of the missions of the Orbiting Carbon Observatory is

A. to observe the formation of CO₂.
B. to collect CO₂ samples from space.
C. to do CO₂ experiments in space.
D. to locate the key places of CO₂ emission.

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单项选择题

According to the news, investment in clean energy

A. tripled in the last two years worldwide.
B. slightly rose even in economic turmoil worldwide.
C. can bring great benefits to the economy.
D. can protect the environment.

单项选择题

Question 30 is based on the following news.

Questions 28 and 29 are based on the following news. One of the missions of the Orbiting Carbon Observatory is 您的浏览器不支持 audio 元素。

Questions 28 and 29 are based on the following news. One of the missions of the Orbiting Carbon Observatory is