正确答案: C

通济渠

题目：隋唐时期，淮水以北新增的有利于农田灌溉的水利工程是

解析：C

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学习资料的答案和解析：

[单选题]CPlants can’t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily change from a liquid to a gas. A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.

producing some chemicals D． sending out electronic signals

[单选题]根据文章，回答 67～70 问题DHave you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the riverbank or from t}le nearby fields．

topsoil

[单选题]

After allB． At last