试题与答案

动词填空 可适当填加助动词或情态动词。 Last Sunday, my fri

题型:填空题

题目:

动词填空 可适当填加助动词或情态动词。

      Last Sunday, my friends Wang Tao, Zhang Jun asked me to go    1     (swim) with them. Soon we got

to the river. They were swimming in it. But I couldn't swim. So I    2    (sit) under a big tree and watching

a little boy    3    (play) with a ball near the river. But the ball    4    (fall) into the water and he fell into the

water, too.

      I was standing up and    5    (call) for help. But my friends    6    (be) far from me and they    7    (not

hear). So I jumped into the water. I didn't know how to swim in it, but I    8    (take) the little boy out of the

water. His parents thanked me very much. They said, "You are a good boy, a good young pioneer."

     When my friends knew this, they all smiled and    9    (say), "You    10    (swim) now."

1._____ 2._____ 3._____ 4._____ 5._____

6._____ 7._____ 8._____ 9._____ 10._____

答案:

1.swimming   2.was sitting   3.playing   4.fell   5.calling

6.were   7. couldn't hear   8.took   9.said   10. can swim

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题型:读图填空题

罗非鱼是杂食性鱼类,在珠江三角洲地区大量养殖,能适应咸、淡水环境。

(1)当罗非鱼由淡水进入咸水,机体会大量脱水,细胞外液渗透压____________,渗透压感受器产生兴奋,并将兴奋传给_____________,促使其释放_____________,该物质促进肾小管和集合管重吸收水,使尿量减少以适应咸水环境。

(2)某实验基地水库中放养了一批罗非鱼。其监测数据显示,a~e段这种罗非鱼的种群数量发生了明显波动,调查发现有人在该水库中放生了大型肉食性鱼(FNE);一段时间后,罗非鱼种群数量达到了相对稳定状态(见上图)。图中显示,罗非鱼种群在a~b段呈______型增长。据图推测,FNE最可能是在___________对应的时间点进入水库;在捕食压力下,罗非鱼种群的环境容纳量接近_______________。

(3)富营养化导致藻类大量繁殖,该水库出现水华现象,浮游动物和鱼类均受到影响。请用文字和箭头描述藻毒素从产毒藻逐级积累到FNE体内的途径。

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