下面有关生物学核心概念的说法和理解错误的是（ ） A．生态系统就是一定区域内生物

凭证式国债一年期的年利率是2.60%，三年期的年利率是3.73%．（国债免征利息税）

（1）王叔叔买了2万元的一年期的国债，到期时，一共可取回多少元？

（2）张叔叔买了3万元的一年期国债和5万元的三年期国债．到期时，这两笔债券各可以获得利息多少元？

电路中电流的大小可以用__________来测量，实验室常用电流表的刻度盘上标着字母__________，使用电流表测量电流时，电流表与用电器要_____联，并且让电流从__________柱流入，从__________柱流出．

使用马尔科夫分析的方法，进行人力资源供给预测的关键是( )。

A．分析劳动力环境

B．分析企业内部空缺职位

C．确定出人员转移率矩阵表

D．分析需要补充的任何职务所要求的人员的数量

按一类精神药品管理的药品是

A．盐酸二氢埃托啡片

B．枸橼酸芬太尼针

C．美沙酮片

D．马吲哚片

E．盐酸吗啡片

D

When a storm is coming, most people leave the area as quickly as possible and head for safety…But there are a few people who will get into their cars and go straight for the center of the storm．These people are willing to risk (冒…危险) being killed by floods or 100-Kilometer- an-hour winds for the excitement of watching the storm close up．

“Storm chasing (追逐)”is becoming an increasingly popular hobby (喜好) ，especially in the Midwest of the United States, where there are frequent storms between March and July．A storm chaser begins the day by checking the Internet for the latest weather reports, and then drives up to l,000 kilometers to where the storm will be and waits for it to develop．

Although anyone can do it，storm chasing is extremely dangerous．The power of a big storm  can throw a cow into the air or destroy a whole house in seconds．Storm chasers are also often hurt in accidents caused by driving in a heavy rain．If you are a beginner, it is much safer to join a group for storm - chasing vacations during the storm season．

Even then，storm chasing is not all adventure and excitement．“Storm chasing is 95％driving，”says Daniel Lynch，who spends most of his summer storm-chasing．“Sometimes you

Can sit around for hours waiting for something to happen，and all you get is blue sky and a few light showers.”

However，for storm chasers，it is all worth it. “When you get close to a storm，it is the most exciting sight you will ever see in your life，”says Jasper Morley．“Every storm is an example of the power of nature．It is the greatest show on Earth．”

57．For storm chasing，the first thing storm chasers do is to       ．

A．head straight for the center of the storm   

B．get into the car for safety

C．wait patiently for the storm to develop

D．collect information about a coming storm

58．Beginners of storm chasing are advised_______

A．not to drive in a heavy rain   

B．to do it in an organized way

C．not to get too close to a storm

D．to spend more time on it in summer

59．By saying“it is all worth it”in the last paragraph，the author means that______

A．storm chasing costs a lot of money

B．storm chasing is worth hours of waiting

C．efforts in storm chasing are well paid

D．a storm presents the greatest show on Earth

60．What can we learn from the text?

A．Sometimes storm chasers get nothing but disappointment． 

B．Many storm chasers get killed in the storms．

C．Storm chasing is becoming popular around the world．

D．Storm chasing is only fit for young people