下列不属于果蔬中的营养物质的是（）。 A.水分 B.矿物质 C.维生素 D.叶绿素

某教师通过调查、访谈、观察等方式研究本地区十几所学校语文教师的课堂教学行为，他所采用的研究方法属于（）。

A．实验研究

B．个案实验

C．描述性研究

D．实验室实验

2013年第十二届全运会，重庆姑娘施廷懋闪耀赛场，轻松夺冠跳水女子全能赛．如图是她（可看作质点）在参加跳板跳水比赛时的v-t图象．t=0是其向上起跳的瞬间．则（　　）

A．t₁时刻开始进入水面

B．t₂时刻到达最高点

C．t₃时刻已浮出水面

D．0～t₂时间内，运动员一直处于失重状态

请你读出图中所示的各测量工具的示数，并把它们填写在下面的横线上：木块的长度是______cm；物体的重力为______N；温度计的示数是______℃．

阅读理解。

     BEIJING, China (CNN)-Chinese workers and army soldiers were racing to sweep snow-covered highways

and railway routes for millions of travelers trapped by cold weather. 

     More than 67 million people have been affected by the weather and economic losses are expected to reach

as much as $3 billion, Chinese officials say. 

     In the past week, the snowstorms have hit the provinces in central, eastern and southern China-places that

used to have mild winters. 

     "We've never seen such a cold weather lasting for such a long time," said Tang Shan, a man in his 70s

Changsha, Hunan Province. "The last time we had one here was over 50 years ago, and not this bad." 

     The snow has blocked roads, railways and airports, leaving tens of millions of travelers stranded (滞留),

officials say. Many of them are going home ahead of the traditional Lunar New Year, also known as the Spring

Festival. 

     The Lunar New Year travel is China's busiest travel period of the year.But the snow is changing travel plans.

Railway and highway routes have been brought to a pause,a situation in which all activity or movement has

stopped and several regional airports have been closed. 

     In the southern city of Guangzhou, as many as 500,000 train passengers were stranded in the past few

days when a power failure in neighboring Hunan seriously damaged the regular train services, local officials

said. About 100,000 passengers crowded the square in front of the train station, while others found shelter

in schools and other public buildings while waiting for their trains. 

     More terrible weather is expected. China's weather office on Monday issued a warning of more severe (恶

劣的) snowstorms in the coming days. If so, the number of stranded travelers will surely increase.

1. What would be the best title for the passage? [ ]

A. Travelers in China

B. Snowstorms Cause Economic Losses

C. Dealing with Terrible Weather

D. Snowstorms Hit Parts of China

2. The word "trapped" underlined in Paragraph 1 can be replaced by "_____". [ ]

A. beaten

B. disturbed

C. blocked

D. destroyed

3. We can know from the passage that . [ ]

A. the coming snowstorms will leave more people stranded

B. there will be more snowstorms next year

C. snowstorms usually cause a power failure

D. more people are going home for Lunar New Year this year

4. The passage is probably taken from a _____. [ ]

A. guidebook

B. news report

C. science magazine

D. textbook

反映疾病严重程度的指标是

A．发病率
B．死亡率
C．感染率
D．病死率
E．生存率