纤维结肠镜可应用于如下情况，除了（） A.下消化道出血 B.结肠息肉 C.结肠癌有穿

定时定量多次给某药(t1/2为4h)，达稳态血药浓度时间为：

A．约20h
B．约10h
C．约30h
D．约40h
E．约50h

–Why do you look so upset?

–The electricity was cut off suddenly and my essay _______ unfinished since.

A．was left

B．has left

C．left

D．has been left

下列哪一项不符合地方性斑疹伤寒（）

A.其病原为莫氏立克次体

B.其病原为普氏立克次体

C.鼠为主要传染源

D.鼠蚤为传播媒介

E.发热病程一般为9～14天

句子翻译。

1. Last night I was preparing for the coming examination ______(突然邻家的噪音打断了我).

2.  However, other students are against the idea, saying that the Beijing Zoo,______(建于1906年,

     有百年历史,国内外闻名).

3. ______(作为高中生), firstly, we are expected to be neatly dressed when at school.

4.  They say making friends on line is a waste of time, ______(这些时间应该更有意义地用在

      学习上).

5.  Dear fellow students, let's start fight now and ______(不遗余力地做一点) every day, every

     hour, and every minute!

市场信息分析的目的是什么？