决定平抛运动飞行时间的因素是（ ） A．初速度 B．抛出时的高度和初速度 C．抛

不属于有机磷农药的是（）

A.马拉硫磷

B.乐果

C.敌百虫

D.西维因

E.敌敌畏

The search for life in the universe took a step forward last month with the opening of the Allen Telescope Array(艾伦望远镜阵列) in Hat Creek, California. The telescopes were partly made possible by a gift of twenty-five million dollars from Paul Allen. The total cost of the project is already fifty million dollars.

At present, there are 42 radio telescopes working at the Hat Creek observatory. The signals they receive are combined to create what is equal to a single, very large telescope. The telescope will be used to observe objects like exploding stars, black holes and other objects that are predicted but have not yet been observed. Seth Shostak of the SETI Institute says this is the first telescope whose main purpose is to search for signals from intelligent life in space. The SETI Institute is based in Mountain View, California. The organization supports the search for other life forms in the universe.

What makes the Allen Telescope Array unusual is that it can collect and study information from a wide area of the sky. In addition, the 42 telescopes can study information about several projects at the same time. That means studies of large areas of the sky can be made faster than ever before.

Some officials think the Allen Telescope Array will be completed in three more years. 350 individual radio telescopes are planned. The new abilities of the Allen Telescope Array will make searching for stars similar to the sun much faster.

An earlier search by SETI, Project Phoenix, studied about 800 stars to a distance of 240 light years. The project ended in 2004. With the Allen Telescope Array, astronomers hope to gather thousands of times more information in the search for life beyond our planet.

小题1:The main purpose of the Allen Telescope Array is          .

A．to serve for the research of weather predication

B．to prepare for the wars against life from the universe

C．to search for signals from intelligent life in space

D．to observe exploding stars, black holes and other objects小题2:From this passage we know that         .

A．the 42 radio telescopes at Hat Creek observatory can work together

B．the total cost of the project came from Paul Allen

C．Hat Creek observatory can receive signals from all parts of the worm

D．Hat Creek observatory is operated by an American named Paul Allen小题3:Which of the following is TRUE according to this passage?

A．The Allen Telescope Array takes much more room than former telescopes.

B．The Allen Telescope Array is still being built at present in the United States.

C．Another 42 radio telescopes will be fixed in the Allen Telescope Array.

D．The SETI Institute is against the search for other life forms in the universes.小题4:With the help of the Allen Telescope Array,         .

A．astronomers can gather more information than before from other planets

B．humans will have more chances to live on other planets than before

C．humans will be able to find more natural resources on other planets

D．scientists will be able to find more natural resources from other planets

如图所示，硬膜外需留置导管一般主张以哪一时间为限（）

A.3天

B.1周

C.2周

D.3个月

E.半年

患儿，男，7个月，咳嗽1周余，3天前起咳嗽加重伴发热，体温波动于37．5～38．3℃，半天来突然烦躁、气促急诊入院。查体：T37．5℃，P185次／分，R65次／分，体重8kg，头围44cm，神倦，烦躁不安，面色苍灰，明显喘憋。方颅，前囟2．5cm×2．5cm。鼻扇，口周发绀。轻度漏斗胸，肋缘外翻，心率185次／分，律整，心音低钝，无杂音，双肺可闻多量喘鸣音及中小水泡音，呼气延长。肝右肋下3．5cm，质软，边略钝，脾未扪及。入院后床边胸片示双肺纹理增粗，可见小斑片状阴影多处。轻度肺气肿。

可继续行下列检查，除外（）

A.鼻咽、气管分泌物、血等检测病原体

B.血常规及细胞形态

C.胸片、心电图、必要时血气分析

D.PPD试验、血电解质检查

E.超声心动图

反射回声频率的改变，取决于反射体的运动，这称为（ ）。

A．入射角度

B．多普勒效应

C．传播

D．自然反射

E．混响