问题 问答题 简答题

红蜘蛛应如何防治?

答案

参考答案:

(1)及时清除枯枝落叶杂草;

(2)药物防治:树木发芽前,喷石硫合剂100倍,灭过冬螨危害期可施5%霸螨灵,浏阳霉素2000倍或2%罗素发,农螨丹1000倍;

(3)无公害农药50%硫悬乳剂,0.3%、0.9%、1.8%齐螨素乳油2000倍,晶体石硫合剂100倍,蚧螨灵2000倍,盆花可用花保,注意各种杀螨剂要交替使用,以减少螨类抗药性。

阅读理解

阅读下面短文,从短文后所给各题的四个选项中,选择最佳选项。

       Once a circle lost a piece of its own. The circle wanted to be whole, so it went around looking for its

missing piece. But because it was not complete, it could only roll (滚动) very slowly. It enjoyed the flowers and

the sunshine along the way. It talked with worms. It found lots of different pieces, but none of them fit. So it

left them all by the side of the road and kept on looking for the missing piece. Then one day the circle found a

piece that fit perfectly (完美). The circle put the missing piece into itself. It could be whole with nothing

missing. It was so happy and began to roll. As it was a perfect circle, it could roll very fast, too fast to see

flowers or talk to worms. It realized how different the world was when it rolled so quickly. It felt so sad that it

stopped, left its found piece by the side of the road and rolled away slowly. 

       Sometimes we are perfect when we lose something. A man who has everything is a poor man in some

ways. He will never have hopes, dreams or something better. He will never know someone is loving him or

someone is giving him something he has always wanted or never had.

       We couldn't be perfect, but we must be brave enough to love, strong enough to forgive, kind enough to

share happiness with others and clever enough to know there is enough love around us and then we can always

live a wonderful time in our lives.

1. The circle rolled very slowly because it ________. [ ]

A. spent much time talking to worms

B. wanted to enjoy the sunshine

C. was looking for its missing piece

D. lost a piece of its own

2. Why did the circle stop when it rolled quickly? Because it ________. [ ]

A. wanted to enjoy the world

B. found a different world

C. wanted to look for another missing piece

D. thought the world changed so quickly

3. The story mainly tells us that _______. [ ]

A. nobody loves us if we give nothing

B. a man who has everything is the happiest

C. losing something may not be a bad thing sometimes

D. we are not whole when we lose something

单项选择题