以下餐巾的使用方法正确的是() A.中途离座,把餐巾放在椅子上 B.用来擦嘴唇嘴角

题型:单项选择题

问题:

以下餐巾的使用方法正确的是()

A.中途离座,把餐巾放在椅子上

B.用来擦嘴唇嘴角

C.用来擦刀叉

D.塞入衣服领口里

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题型:单项选择题

如图,简单谐横波在t时刻的波形如实线所示,经过△t=3s,其波形如虚线所示.已知图中x1与x2相距1m,波的周期为T,且2T<△t<4T.则可能的最小波速为______m/s,最小周期为______s.

题型:单项选择题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

“The chair is out to kill us,” says James Levine, a professor at the Mayo School of Medicine. Most of us have years of sitting experiences, considering ourselves quite good at it. ___小题1:____But unfortunately ,a good deal of data suggests that we’re off our chairs to spend so much time on the vast variety of other seats where we’re fond of parking our bottoms .Here are some things that scientists have learned about the insidious (阴险的)nature of sitting.

Sitting position has gone wrong . 

The human body is designed for walking. ____小题2:___ But lately, not so much. In general, scientists believe ,Americans now sit for more than half of their walking hours .Sadly ,the sitting position exerts force on the body which can lead to a lot of trouble including poor circulation (血液循环) ,aches and pains.

____小题3:___

We’re not using much energy when we’re sitting still. ___小题4:___ It is also just another way of saying “watch out for extra pounds .”It is mainly the chair that has caused the increase in obesity rates .A person with a desk job may burn 300 calories a day at work , but the same person might burn 2,300 calories a day in jobs that require considerable physical efforts. In other words , we need more walking to burn more calories.

Realize the damage.

Sitting at your desk and working hard for hours on end can increase your chances of getting a promotion. ____小题5:____ When comparing people who spent the most time sitting with those who spent the least time sitting, researchers found more sitting increases the risks of death from all causes.

A.Make people become too fat.

B.We will say nature intends us to do it.

C.They ought to work out to build their bodies.

D.But it also brings people diseases or even early deathE. Certainly people have done that for thousands of years

F. We should be more patient and work longer than before.

G. That is just another way of saying“we are not burning many calories”.

题型:单项选择题

山西的水资源承载状况较为严峻,水资源已经成为制约山西省社会经济与生态环境协调发展的主要因素。承载力强度指标是指水资源承载人口与实际人口之比。读表一回答1~2题。

表一

1、读表一可知,水资源承载盈余最多和水资源严重超载的地区分别是[ ]

A、晋城

B、长治

C、运城

D、临汾

2、下列有关山西水资源可持续利用的“节流”措施说法正确的是[ ]

A、发展高产值低耗水农业

B、提高工业用水的重复利用率

C、制定合理的跨流域调水方案

D、修建蓄洪储水工程

题型:单项选择题

前列腺素E在眼局部高浓度使用时,会产生的影响是()

A.瞳孔缩小,对眼压改变不大

B.对瞳孔影响不大,眼压升高

C.瞳孔缩小,眼压升高

D.瞳孔缩小,眼压下降

E.瞳孔增大,眼压升高

题型:单项选择题

为提高诊断试验的灵敏度,对几个独立实验可( )

A.串联使用

B.并联使用

C.先串联后并联使用

D.要求每个实验假阳性率低

E.要求每个实验特异度低

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