已知98％的浓硫酸的物质的量浓度为18.4mol／L，则49％的硫酸溶液的物质的

下列有关传染病潜伏期流行病学意义的说法中，不正确的是（）。

A.判断患者受感染时间，从而追踪传染源、查找传播途径

B.决定传染病病人隔离期限的重要依据

C.确定免疫接种时间

D.评价预防措施的效果

E.影响疾病的流行特征

人民警察的义务来源于( )

A．人民警察的职责

B．人民警察的职权

C．法律的规定

D．国家的任用行为

行政处罚法是根据（）制定的。

I live in north Celebes which is near Philippines. Since early December 2010 most tropical regions have been frequently hit by rain. Just like my hometown, tropical regions only have two seasons, including the dry season that usually starts from April to September and the wet or rainy season which usually happens from October to March. But, it could be indeterminate. Sometimes the rainy season can come a month earlier or later. It can be prolonged even more than 4 months and so can the dry season. Even during the dry season, rain can occur several times in certain areas.

The prolonged dry season in tropical areas usually causes a lot of losses. It will be very harmful to local farmers, because most of the tropical areas sre regions of the developing countries. Sometimes agricultural and plantation crops will be damaged because of so much dry land and the fact that the river used to flow the water for rice fields are also dry. Rain is very important for plants because rain contains many nutrients that plants are in great need of.

What’s more, if the prolonged rainy season arrives and then floods usually occur in certain areas of low lands. Even for the capital city of Jakarta floods have struck several times during the prolonged rainy season. In addition to floods, the rainy season can cause many diseases. During the dry season, diseases are usually caused by mosquitoes such as dengue fever. While in the rainy season, people who have the weak immune will be more easily attacked by some diseases such as flu, fever, diarrhea, and much more.

If you live in the other places and want to travel to the tropical regions, make sure that you have known much about the season and the effect for these months in which you want to travel as tourists. Only in that way, can you at least prepare to deal with tropical weather.

小题1:The underlined word “indeterminate” in paragraph 1 can be replaced by “ _____”

A．uncertain

B．unknown

C．untrue

D．unbelievable小题2:The second paragraph mainly tells us something about _____.

A．the effects of the dry season.

B．the benefits of the rainy season.

C．the growth of dry land

D．the diseases in the dry season小题3:We can learn from the passage that in the wet season, _____

A．the capital of Jakarta is flooded every year

B．more crops will die after being flooded for so long.

C．mosquitoes will spread more diseases among the crowd.

D．people with weak immune might be attacked by some diseases小题4:The main purpose of this passage is to introduce _____.

A．some interesting facts of tropical regions

B．some knowledge about tropical regions to travelers

C．some knowledge about how to live well in different regions.

D．some differences between dry and wet seasons in tropical regions.

下列属于右向左分流型的先天性心脏病是（）。

A.完全型大动脉转位

B.室间隔缺损

C.房间隔缺损

D.动脉导管未闭

E.右冠状动脉一右室瘘