用集气瓶可完成多种实验．对下列实验示意图的分析正确的是 A．连接Ⅰ、Ⅲ装置，可

男性，56岁，近日来感心悸，乏力，头晕，心电图示P-R间期在相继的心动周期中逐渐延长，最后发生QRS波群脱漏，如此周而复始。最可能是( )

A．Ⅱ度Ⅱ型房室传导阻滞
B．Ⅱ度Ⅰ型房室传导阻滞
C．心房颤动
D．Ⅰ度房室传导阻滞
E．Ⅲ度房室传导阻滞

钴-60γ线与200KV-400KV-X线相比，其优点为

A.穿透力强，皮肤剂量低，骨和软组织吸收相同，旁向散射大

B.穿透力强，皮肤剂量低，骨和软组织吸收相同，旁向散射小

C.穿透力强，皮肤剂量高，骨和软组织吸收相同，旁向散射小

D.穿透力强，皮肤剂量高，骨和软组织吸收相同，旁向散射大

E.穿透力强，皮肤剂量低，骨和软组织吸收不相同，旁向散射小

小题1:What is Kelly Chan going to do?

A．To hold a concert.

B．To go on a diet.

C．To watch a game.

D．To make a dress.小题2:According to the news the player from ________ won the tennis match on Saturday.

A．Russia

B．Japan

C．South Korea

D．America小题3:The medical group from America said last week that _________.

A．America has too many good athletes

B．children shouldn’t have too many soft drink

C．schools should organize more picnics

D．most parents in America have health problem小题4:From the news we know that __________.

A．Kelly Chan has been dancing with 40 people

B．Maria Sharapova has won the Japan Open 17 times

C．soft drinks and fast food are really good for children’s health

D．many American children have too much fast food and too little exercise

常绿树种的移栽宜在其（）期进行，我区常绿树种的移栽宜在（）季为宜。

前置胎盘时，期待疗法不适用于

A．妊娠37周以前

B．胎儿存活

C．估计胎儿体重小于2300g

D． * * 出血量不多

E．已临产