题干

下表为关于农作物AB在相同土壤中N、P、K三元素肥效实验的结果记录(“+”表示施肥,“﹣”表示未施肥).请据表中的数据,判断正确的结论是(  )


农作物A

农作物B

肥料

成分

N

+

﹣

+

+

﹣

+

﹣

+

+

﹣

P

+

﹣

+

﹣

+

+

﹣

+

﹣

+

K

+

﹣

﹣

+

+

+

﹣

﹣

+

+

产量

100

54

83

65

100

100

34

70

55

40

A:从农作物A的构成来说,N是非必需元素

B:农作物A可能是豆科植物,有其他获得N元素的途径

C:对农作物B来说,三种元素中K最重要

D:两种农作物对土壤中N、P、K的需求量基本相同

上一题 下一题 0.0难度 选择题 更新时间:2012-02-02 01:11:36

答案(点此获取答案解析)

B

同类题4

完形填空

    A wealthy old lady decides to travel to Africa, taking her faithful (忠诚的) old dog Cuddles along for company. One day, the dog starts chasing butterflies and before long, Cuddles discovers that he's 1 Wandering about, he notices a2heading in his direction with the intention of eating him for lunch. The old dog thinks, “Oh, oh! I'm in deep3now!” Noticing some bones on the ground close by, he4settles down to chew on the bones with his back to the5leopard.

    Just as the leopard is about to6 the old dog exclaims loudly, “Boy, that was one delicious leopard! I7if there are any more around here?” Hearing this, the young leopard stops his attack in mid-strike, a look of8comes over him and he runs back into the trees. “Whew!”, says the leopard, “That was close! That dog nearly9me!”

    Meanwhile, a monkey who had been10the whole scene from a nearby tree decides that he can put this knowledge to good use and trade it for11from the leopard. So off he goes … but the old dog sees him12the leopard and figures that something must be up. The monkey soon catches up with the leopard, and explains that the dog is13and strikes a deal with the leopard.

    The young leopard is angry about being14and says, “Here, monkey, jump on my back and see what's going to happen to that15dog!”

    The old dog sees the leopard coming with the monkey on his back and thinks, “What am I going to do now?” But instead of16 the dog sits down with his back to his attackers17he hasn't seen them yet, and just when they get close enough to18 the old dog says: “Where's that darn monkey? I19 him off an hour ago to bring me another leopard!”

    Life is not about holding all the good cards, but in20those that you hold well.