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问题 单项选择题

农田排水的主要作用是改善土壤环境、促进作物生长、（）。

A、有利于田间作业和控制病虫草害

B、节省肥料和增强作物抗性

C、有利田间作业和节省肥料

D、增强作物抗性和控制病虫草害

答案

参考答案：A

完形填空

看图阅读下面短文，并借助上下文补充所缺信息。每个空只能填写一个形式正确、意义相符的单词。

Thursday, September 20th, 2012

Today wasn’t a very good day for me. I usually get up at six o’clock, but this morning I didn’t get up         seven o’clock. I got dressed quickly and ate breakfast. It was so          that I ran all the way to the bus stop. Unfortunately, on the way I         down. My books and homework fell into the street. Papers went everywhere. At the bus stop, I waited and waited while lots of full         went by. I was so upset. At last one came but it was also full, and it went right past. But then it stopped a few yards away and someone        off. I ran wildly down the road and got the only spare seat.

At noon, I was very hungry, but I didn’t have         to buy lunch. My lunch money was at home on my desk. Then in math class, the teacher asked for my homework. I looked in my schoolbag, but my homework wasn’t there. Maybe I had lost         when fell down. The teacher punished me         making me clean the classroom after class.

My goodness, I finished        at last. When I put my things in my schoolbag and got ready to go home, I        my homework right at the bottom.
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单项选择题 A1/A2型题

用原子吸收光谱法测定生物材料中微量镉时，通常选择哪种分析线（）。

A.第一激发态与第二激发态之间发射的共振线

B.第一激发态与基态之间发射的共振线

C.第三激发态与基态之间发射的共振线

D.第二激发态与基态之间发射的共振线

E.第一激发态与第三激发态之间发射的共振线
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