属于细菌的休眠状态（） A.噬菌体 B.毒力变异 C.基因重组 D.细菌素 E.芽孢

Mr. and Mrs. Green had different ideas about where to go last weekend. Mrs Green wanted to go to Florida(佛罗里达州) to see her sister, but Mr Green didn’t like to go there. He wanted to go to Maine(缅因州).

“Florida is too hot in summer,” Mr Green said to Mrs Green.

“Maine is quite cold,” said Mrs Green, “I like swimming, but the water in Maine is usually not warm enough.”

“Florida is too far,” said Mr Green, “We don’t have enouh time to drive there. It’ll take us more than two days.”

Just then, the telephone rang. Mr Green answered the phone. It was his mother. “Is that Jim speaking? Please cme quickly. I need help. I’m calling from the hospital in Boston.” She said.

They stopped the discussion(讨论), and they left for Boston at once.

小题1:Where did Mr Green want to go last weekend?

A．Florida.

B．Maine.

C．Boston.

D．London.小题2:What did Mrs Green want to do last weeekend?

A．To do some shopping.

B．To drive to Maine.

C．To see her sister.

D．To watch TV.小题3:Who called them when they were talking?

A．Mr Green.

B．Mr Green’s wife.

C．Mr Green’s mother

D．Mr Green’s son小题4:Where did Mr Green’s mother live?

A．Florida.

B．Maine.

C．Boston.

D．London.小题5:Where did they go in the end?

A．Boston

B．Maine.

C．Florida.

D．London

函数f(x) 的定义域为R，且对任意x,y∈R 都有f(x+y)=f(x)+f(y)，又

当x>0 时，f(x)＜0,且f(1)=－2.

（Ⅰ）求证：f(x) 既是奇函数又是R上的减函数；

（Ⅱ）求f(x)在[－3,3]的最大值和最小值.

从事科学实验的重要环节是进行科学实验设计。科学实验的正确步骤应为：①明确实验目的；②收集有关资料；③设计合理方案；④进行科学实验。请你按照以上四步，完成以下实验设计。（所用装置图用序号表示）

(1)①明确实验日的：在实验室里制取氧气。

②收集有关资料：双氧水是一种无色___________，二氧化锰是一种___________；反应条件___________；氧气的密度___________于空气的密度且___________溶于水。双氧水与二氧化锰混合制取氧气的文字表达式为________________________________________________。

③设计合理方案：发生装置选用___________，收集装置选用___________。

④进行科学实验。

(2)在实验室中，常用加热固体氯化铵和氢氧化钙混合物的方法制取氨气，其反应的文字表达式为：已知在标准状况下，氨气的密度为0.771g/L，空气的密度为1.293g/L．且在常温下，1体积水能溶解700体积的氨气。

①明确实验目的：________________________________________________________。

②收集有关资料：氯化铵和氢氧化钙都是固体，反应备件加热，氨气密度比空气小，极易溶于水.

③设计合理方案：发生装置选用__________，收集装置选用__________。

④进行科学实验。

男，20岁，四肢无力四天，呼吸困难1天，无大小便障碍，无发热。查体：四肢肌力1级，腱反射消失，病理征未见异常，首先考虑的疾病是（）

A.脊髓灰质炎

B.吉兰巴雷综合征

C.周期性麻痹

D.重症肌无力

E.急性脊髓炎

对窒息或心跳、呼吸停止不久的伤员必须（）。

A、先复苏后搬运

B、先止血后搬运

C、先固定后搬运