We need trees because they____CO2 and let out O2
We need trees because they____CO2 and let out O2 A take off B take in C take out D take away
B take in ---吸收 的意思 我们需要树木,因为它们吸收二氧化碳,释放出氧气
We need trees because they____CO2 and let out O2。 分析: A take off ---起飞,脱掉 举例: The plane took off despite the fog。 尽管有雾，飞机仍照常起飞。
B take in ---接受(理解,包括,定阅,欺骗,收进,吸收,对。。。加以考虑) 举例: Fish take in oxygen through their gills。 鱼通过鳃摄取氧气。 C take out ---取出(自动取出装置) 举例: How much do you need to take out (of the bank)? 你需要（从银行）取多少钱? D take away ---拿走(减去,解除) 举例: The doctor has given her some tablets to take away the pain。
医生给了她一些止疼药片。 本题选B take in,吸收二氧化碳。
B 接受，吸收
答：哈哈，还不是一样，应用不同而已，只有你是死脑筋。详情>>
