问题 问答题 简答题

黑森瘿蚊以何种方式远传?检疫中,如何判断幼虫的死亡状况?

答案

参考答案:

远传:

主要靠围蛹随麦秆和寄主植物制成的包装铺垫材料远距离传播

少量围蛹也可能混入麦种子而被携带

成虫可随风扩散蔓延。

判断过冬幼虫死活的方法:①将待检幼虫浸入二硝基苯饱和溶液内5~6小时(18~20℃),或3小时(30℃),②取出幼虫,置于滤纸上吸干多余溶液,③虫体放入盛浓氨水的玻管中,④活幼虫在试验开始后10~15分钟变为红色,30分钟后死亡个体与成活个体均变为褐色。

阅读理解

Paris is the capital of the European nation of France. It is also one of the most beautiful and most famous cities in the world.

Paris is called the City of Light. It is also an international fashion center. What women are wearing in Paris will be worn by women all over the world. Paris is also a famous world center of education. For example, it is where the headquarters of UNESCO, the United Nations Educational, Scientific and Cultural Organization.

The Seine River divides the city into two parts. Thirty-two bridges cross this beautiful river. The oldest and perhaps most well-known is the Pont Neuf, which was built in the sixteenth century.  The Sorbonne, a famous university, stands on the left bank of the river. There are many other famous places in Paris, such as the famous museum, the Louvre, as well as the Notre Dame. However, the most famous building in this city is Eiffel Tower.

Paris is named after a group of people called the Parisii. They built a small village on an island in the middle of the Seine River about two thousand years ago. This island, called the lie de la Cite, is where Notre Dame lies. Today around eight million people live in the Paris area.

小题1:This article mainly tells us about       .

A.the buildings in Paris

B.the general situations of Paris

C.the center of the world

D.the famous buildings along the Seine River小题2:From the passage we may conclude that       .

A.the clothes worn by women in Paris are liked by women all over the world

B.women in Paris sell their clothes all over the world

C.women from all over the world go to Paris and wear their own clothes

D.women from all over the world like to go to Paris to buy clothes小题3:The building of        is the most famous building in Paris.

A.UNESCO

B.the Pont Neuf

C.Eiffel Tower

D.Notre Dame小题4:Which of the following descriptions of Paris is not true according to the text?

A.Paris is the capital of the European nation of France.

B.Paris is called the City of Light.

C.The United Nations Educational, Scientific and Cultural Organization is located in Paris.

D.The most famous building in this city is the famous museum, the Louvre.

单项选择题