【单选题】短文 3 It is one of nature’s great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants leaves are bathed in a sea of nitrogen gas....
A.
That of a farmer whose crops have failed because the normal midseason rains did not materialize and no preparations for irrigation had been made.
B.
That of a long-distance runner who loses a marathon race because of a wrong turn that cost him twenty seconds.
C.
That of a motorist who runs out of gas a mere five miles from the nearest gas station.
D.
That of shipwrecked sailors at sea in a lifeboat, with one flask of drinking water to share among them.
E.
That of travelers who want to reach their destination as fast and as cheaply as possible, but find that cost increases as travel speed increases.
【单选题】关于薁类化合物,错误的说法是( )。
B.
具有五元环与八元环骈合成的不饱和共轭体系骨架
【判断题】具有替代性的农产品之间,一种农产品的价格上涨时,另一种农产品的需求量会增加。
【简答题】忽报人间曾伏虎,————————。出自《蝶念花.答李淑一》
【判断题】薁类化合物沸点高,不溶于水,但可溶于60%~65%的硫酸。
【简答题】“忽报人间曾伏虎”中“伏虎”的意思是指( )。
【单选题】《蝶恋花·答李淑一》中“忽报人间曾伏虎”中“曾”字的正确读音是( )
【单选题】关于薁类化合物,下列说法错误的是( )。
B.
具有五元环与八元环骈合成的不饱和共轭体系骨架