噬菌体进入大肠杆菌细胞后通过( )。而进入溶原状态。 A．同源重组 B．位点特异

What will the weather be like in the future? Some people say they can know the weather from animals.

If birds are flying high in the sky, there will be a nice day. When they sit in trees or stay close together, bad weather is on the way. Ants often build their homes on the steep (陡峭的) side just before the rain comes. Cats like to clean their ears before the rain. Chickens make a loud noise and run here and there when the rain is coming. Frogs will stay in the water and make a lot of noise, too. But on a nice day, they are quiet and jump out of the water. Turtles (海龟) often look for higher ground and cows like to lie down when the rain is on the way. 

小题1:How will the weather be if birds are flying high in the sky?

A．Sunny.

B．Windy.

C．Rainy.

D．Snowy.小题2:What do cats like to do before the rain?

A．Clean their feet.

B．Clean their ears.

C．Run everywhere.

D．Stay at home.小题3:How many animals does the passage mention (提到)?

A．Three.

B．Four.

C．Five.

D．Seven.小题4:What’s the best title for the passage?

A．Animals.

B．Animals like different weather.

C．The Weather.

D．Animals and weather.

现有下列如图1所示的A、B、C、D、E五种实验装置：

（1）写出对应序号的仪器名称：①______ ②______

（2）实验室加热高锰酸钾制取氧气时，可以选择的发生装置是______，（填装置序号，下同）该反应的化学方程式为______．要收集一瓶较纯净的氧气最好选择______装置来收集氧气．若用C装置来收集氧气，检验是否收集满的方法是______．

（3）实验室用石灰石与稀盐酸来制取二氧化碳，收集二氧化碳时应选择______装置，选择此收集装置的理由是______．

（4）将二氧化碳依次通过图2装置，写出A、B 两处可观察到的现象：

A处：现象：______，B处：现象：______．

关于小儿惊厥，叙述错误的是（）

A.是脑功能紊乱致神经细胞异常放电所致

B.是儿科常见急症

C.常伴有中枢神经系统异常

D.多数预后良好，且用止惊药物能控制

E.部分与遗传因素有关

脉动磁通势在空间按（）规律分布。

A、正弦；

B、余弦；

C、梯形波；

D、锯齿波。

《日瓦戈医生》的男女主人公分别是日瓦戈和拉莉萨。