单项选择题
A.A party is where you go to have a good time.
B.Democracy is a system of government in which every citizen in the country can vote to elect its government officials.
C.An astronomer is one who studies astronomy.
D.Pollution is the process that chemicals are dumped into rivers.
单项选择题 Do you mean to risk（）cold by going out now that it has started pouring with rain？
判断题 We can only use a stipulated definition as the thesis of a definition essay.（）
判断题 In terms of agriculture，the heavy snowfall is beneficial because when the snow covers the fields，the low temperature can kill the insects inside the earth.（）