John was so sleepy that he could hardly keep his eyes ________ (opening).
铯原子钟是精确的计时仪器。图 1 中铯原子从 O 点以 100m/s 的初速度在真空中做平抛运动,到达竖直平面 MN 所用时间为 t 1 ;图 2 中铯原子在真空中从P 点做竖直上抛运动,到达最高点 Q 再返回 P 点,整个过程所用时间为 t 2 。 O点到竖直平面 MN、P 点到 Q 点的距离均为 0.2m。重力加速度取 g=10m/s 2 。则 t 1 : t 2 为
A.100:1
B.1:100
C.1:200
D.200:1
在下面一段话的空缺处依次填入词语,最恰当的一组是( )
古代信函以何种方式邮递,与汉乐府“双鲤鱼”是否为刻作鱼形的木质信函,本是两个不能 的问题。后世以“鱼书”“鱼素”“鲤缄”等代称书信,皆是 这首汉乐府,并不能表明后人将其理解为鱼形信函。孟浩然诗曰“尺书能不吝,时望鲤鱼传”,至少在明代以前,并无人 此“鲤鱼”非真鲤鱼。
A.相提并论 化用 质疑
B.混为一谈 引用 质疑
C.混为一谈 化用 置疑
D.相提并论 引用 置疑
内环境是人体细胞生活的直接环境,正常情况下能够维持相对稳定的状态,这是人体完成各项生命活动的必要条件。
(1)人体内环境的理化性质及化学成分含量不是恒定不变的,而是会出现一定的波动,原因是外界环境是不断变化的和________________________。
(2)下图1为体内细胞与外界环境进行物质交换的四大系统模式图。其中3、4分别是____________________。
(3)如图2是某同学构建的人体体液之间的关系模型,其中d表示________,能表示细胞内液的是________。
(4)尝试构建人体肺部的肺泡部位血浆、组织液、成熟红细胞内液间O2扩散的模型(在下图用实线箭头连接)。
肝细胞产生的CO2分子最终通过呼气排出体外至少需要经过________层磷脂分子。
______ us prepare for the exam, the teacher suggested reading through our notes.
A. To help B. Helped C. Helping D. Being helped
某多肽化合物水解后可得到如下三种氨基酸,下列叙述正确的是( )
A.该多肽含三个肽键
B.甘氨酸的R基是—COOH
C.该多肽是三肽化合物
D.赖氨酸的R基中含有—NH2
Could the device, smartphone or PC, which you're using affect the moral decisions you make when using it? To test it, researchers presented multiple dilemmas to a sample set of 1,010 people. The participants were assigned a device at random.
One case of the questions participants were asked is the classic “trolley (有轨电车) problem”: A runaway trolley is headed towards five people tied up on a set of train tracks. You can do nothing, resulting in the deaths of five people, or push a man off a bridge, which will stop the trolley. The practical response is to kill one man to save five lives, which 33.5 percent of smartphone users chose, compared to 22.3 percent of PC users.
“What we found in our study is that when people used a smartphone to view classic moral problems, they were more likely to make more unemotional, reasonable decisions when presented with a highly emotional dilemma,” Dr Albert BarqueDuran, the lead author of the study, told City University of London. “This could be due to the increased time pressure often present with smartphones and also the increased psychological distance which can occur when we use such devices compared to PCs.”
As for why the researchers started this study, Dr BarqueDuran noted, “Due to the fact that our social lives, work and even shopping take place online, it is important to think about how the contexts where we typically face moral decisions and are asked to engage in moral behavior have changed, and the impact this could have on the hundreds of millions of people who use such devices daily.” It's clear that we need more research on how our devices affect our moral decisionmaking because we're using screens at an everincreasing rate.
篇章导读:本文是一篇科普说明文。你所使用的手机或电脑设备是否影响你的道德决策?为此,研究者对1,010位参与者做了研究。
1.Why did the author mention the trolley problem?
A.To introduce a difficult problem to readers.
B.To introduce the aim of carrying out the study.
C.To show an example of the questions in the study.
D.To show the difficulty in dealing with dilemmas.
2.How do the smartphone users of the study behave in dealing with emotional dilemmas?
A.Calmly. B.Cruelly.
C.Hesitantly. D.Enthusiastically.
3.Dr Albert believes that compared with PCs, smartphones ________.
A.help people bear more pressure
B.help people make decisions quicker
C.make people feel more mentally distant
D.make people stay happier to solve problems
4.What can we infer from the text?
A.Shopping online has a great effect on making moral decisions.
B.The people using smartphones are more than those using PCs.
C.People who often use smartphones or PCs always meet with dilemmas.
D.It is common for people to be involved in making moral decisions in daily life.