【单选题】
Travel in space can be very exciting; ___, it can also be boring and lonely at times.
A. so
B. however
C. thus
D. therefore
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相关试题
【单选题】
Politicians should not ___ in business affairs that might affect their political judgment.
A. engage
B. embrace
C. depart
D. treasure
【单选题】
I wish to ___ a master’s degree in electric engineering after I graduate from college.
A. pledge
B. explore
C. pursue
D. approach
【单选题】
There is no greater importance ___ cultivating independence in children.
A. in
B. than
C. of
D. with
【单选题】
He has made it very clear ___ we should observe the new rules.
A. what
B. which
C. those
D. that
【单选题】
It was when I read his letter ___ I realized he had given me huge help.
A. that
B. then
C. before
D. after
【单选题】
Don’t worry too much, Jane. Your son ___ home already. Let’s go back and check it out.
A. returned
B. will return
C. has returned
D. may have returned
【单选题】
I believe friendship is an essential element of making a healthy, ___ life.
A. flexible
B. rewarding
C. wealthy
D. inquisitive
【单选题】
___ they have written about the behaviors of animals is hardly anything new.
A. That
B. This
C. What
D. Which
【单选题】
No other drugs are as good as this one; it must have been based on a(n) ___ formula (配方).
A. enormous
B. stimulating
C. unique
D. overwhelming
【单选题】
Mothers tend to be too ___ toward their children. They should let them see more of the worl D.
A. hopeful
B. protective
C. modest
D. encouraging
【单选题】
The investigation ___ evidence of a large-scale illegal trade in wild birds.
A. uncovered
B. outweighed
C. overwhelmed
D. evolved
【单选题】
Poor Laura! I feel so sorry for her. When she fell, she hurt her arm and, ___, broke her glasses.
A. in advance
B. in addition
C. over time
D. on the other hand
【单选题】
Showing some sense of humor can be a(n) ___ way to deal with some stressful situations.
A. genuine
B. available
C. effective
D. favorite
【单选题】
It will be worth the efforts even if you fail; the rewards you ___ will be great.
A. reap
B. boast
C. assure
D. cultivate
【单选题】
He suggested transporting the supplies by air. But it is absolutely ___, for it will cost too much.
A. unusual
B. uncertain
C. impractical
D. impressive
【单选题】
The newspaper didn’t mention the ___ of the damage caused by the fire.
A. range
B. level
C. extent
D. quantity
【单选题】
Do you ___ her novels as serious literature or as mere entertainment?
A. classify
B. notify
C. simplify
D. justify
【单选题】
He doesn’t ___ of buying a house this year because the bank has refused to lend him any money.
A. afford
B. make the most
C. run out
D. stand a chance
【单选题】
If you don’t ___ cooking today, we can go out to eat at the new restaurant.
A. would like
B. go on with
C. feel like
D. figure out、
【单选题】
Bullying (恃强欺弱) can ___ a climate of fear and anxiety in school, and prevent students from focusing on their schoolwork.
A. keep back
B. give rise to
C. feel like
D. make use of
【单选题】
Science can now ___ many things which were thought to be mysterious by ancient people.
A. care for
B. lay out
C. account for
D. set up
【单选题】
The school has ___ many after-class activity groups for the pupils to make their spare time more colorful.
A. set up
B. set off
C. set out
D. set down
【单选题】
When he was a small kid, he ___ from his peers because he could read fast and remember whatever he rea D.
A. showed off
B. worked out
C. stood out
D. straightened up
【单选题】
The fall in the number of deaths from heart disease is generally ___ improvements in diet.
A. put up with
B. attributed to
C. added to
D. replaced with
【单选题】
We can be partners for now, but ultimately you have to ___ to develop a new software for our project.
A. keep up
B. fire off
C. make sense
D. take the lead
【单选题】
Emotional Intelligence (情商) could be of practical use in many ___ such as how companies decide which job applicant to hire, how parents should raise their children, how schools should teach the students, and so on.
A. aspects
B. disciplines
C. structures
D. opportunities
【单选题】
The teacher should praise students for their correct answers and also suggest ___ possibilities.
A. unlimited
B. unique
C. alternative
D. essential
【单选题】
In some classrooms, desks are arranged in a U-shape, so the teacher can ___ easily with the students.
A. interrupt
B. interact
C. interpret
D. interview
【单选题】
Computer technology ___ individuals to educate themselves and adapt to a constantly changing job market.
A. lets
B. makes
C. enables
D. provides
【单选题】
Our hope for an enjoyable dinner was instantly ___ when the waiter dropped a salad plate on my hea D.
A. spoiled
B. restricted
C. exploded
D. vanished
【单选题】
___ the world has ever seen has occurred in the information and communications technologies.
A. Great a change
B. The great change
C. A greatest change
D. The greatest change
【单选题】
___ so many people around, it wasn’t convenient to have a long talk with him.
A. As
B. When
C. With
D. Since
【单选题】
Alice used to be terribly shy, but working abroad for a year has completely ___ her.
A. solved
B. transformed
C. characterized
D. regulated
【单选题】
Chinese Mandarin (普通话) is ___ for foreigners to learn because the changes in the tone will totally change the meaning of words.
A. difficult
B. accessible
C. competitive
D. easy
【单选题】
Take action on those things that will have the biggest ___ impact on your life with the least amount of effort.
A. portable
B. positive
C. sophisticated
D. moderate
【单选题】
The adoption of this measure will greatly reduce the ___ of greenhouse gas emissions (排放物), which may help slow global warming.
A. loan
B. decline
C. release
D. response
【单选题】
I think I have a healthy lifestyle. I eat a lot of fruit and vegetables, and I’m a ___ drinker.
A. moderate
B. heavy
C. gradual
D. delicate
【单选题】
In a way the human race needs to improve its mental and physical qualities if it is to deal with the more and more ___ world and meet new challenges.
A. typical
B. complex
C. rational
D. orderly
【单选题】
If a person simply does not care about this activity, it’s ___ impossible to get him to participate.
A. barely
B. seldom
C. hardly
D. practically
【单选题】
Sometimes, even when the mind ___ functioning, the body keeps on working normally.
A. ceases
B. arouses
C. regulates
D. specializes
推荐试题
【单选题】
在骨骼肌标本浸液中加入筒箭毒碱后.刺激支配该肌的运动神经纤维，肌细胞终板电位的变化是___
A. 去极化加大
B. 维持原水平
C. 去极化减小
D. 爆发动作电位
E. 发生超极化
【单选题】
下列神经递质中，未见于周围神经系统中的是___
A. 多巴胺
B. 肾上腺素
C. 腺苷
D. ATP
E. 5-羟色胺
【单选题】
下列神经纤维中,属于肾上腺素能纤维的是___
A. 支配肾上腺髓质的神经
B. 骨骼肌交感舒血管神经
C. 交感缩血管神经
D. 骨骼肌运动神经
E. 支配多数小汗腺的神经
【单选题】
由α受体介导的生理效应是___
A. 瞳孔扩大
B. 心率加快
C. 支气管扩张
D. 糖酵解加强
E. 脂肪分解加强
【单选题】
去甲肾上腺素与α受体结合后引起舒张效应的平滑肌是___
A. 血管平滑肌
B. 子宫平滑肌
C. 虹膜辐射状肌
D. 胃肠括约肌
E. 小肠平滑肌
【单选题】
由β受体介导的生理效应是___
A. 骨骼肌血管收缩
B. 胃肠括约肌收缩
C. 膀胱逼尿肌收缩
D. 竖毛肌收缩
E. 糖酵解加强
【单选题】
去甲肾上腺素与β受体结合后引起收缩或收缩加强的肌组织是___
A. 心房肌
B. 子宫平滑肌
C. 小肠平滑肌
D. 血管平滑肌
E. 支气管平滑肌
【单选题】
下列各项中，属于条件反射的是___
A. 咀嚼、吞咽食物引起胃液分泌
B. 异物接触眼球引起眼睑闭合
C. 叩击股四头肌腱引起小腿前伸
D. 强光刺激视网膜引起瞳孔缩小
E. 闻到食物香味引起唾液分泌
【单选题】
完成一个反射所需时间的长短主要取决于___
A. 传入与传出纤维的传导速度
B. 刺激的强弱和性质
C. 经过中枢突触的多少
D. 感受器的敏感性
E. 效应器的敏感性
【单选题】
下列中枢神经元联联系方式中，能产生后发放效应的是___
A. 辐散式联系
B. 聚合式联系
C. 链锁式联系
D. 环式联系
E. 单线式联系
【单选题】
下列关于化学性突触传递特征的叙述，正确的是___
A. 双向传播
B. 不衰减传递
C. 兴奋节律不变
D. 对内环境变化敏感
E. 不易疲劳
【单选题】
突触后抑制的产生机制是___
A. 进入突触前末梢Ca2+量减少
B. 突触前末梢递质释放量减少
C. 抑制一兴奋性中间神经元
D. 兴奋一抑制性中间神经元
E. 突触后膜去极化程度减小
【单选题】
下列关于传入侧支性抑制的描述，正确的是___
A. 传入侧支负反馈抑制自身胞体
B. 传入纤维主干与侧支释放不同递质
C. 通过交互性突触而形成交互抑制
D. 通过抑制一兴奋性中间神经元实现
E. 意义在于协调不同中枢的活动
【单选题】
下列关于回返性抑制的描述，正确的是___
A. 经自身受体抑制递质释放而实现
B. 通过串联性突触而起抑制作用
C. 细胞内共存兴奋性和抑制性递质
D. 能使同一中枢神经元同步活动
E. 能使兴奋神经元周边的神经元抑制
【单选题】
突触前抑制的特点是___
A. 突触前膜超极化
B. 突触前轴突末梢释放抑制性递质
C. 突触后膜的兴奋性降低
D. 突触后膜的兴奋性突触后电位降低
E. 通过轴突-树突突触的活动实现
【单选题】
下列关于感受器电位的描述，错误的是___
A. 具有局部电位的性质
B. 与动作电位的发生部位是分开的
C. 与启动电位无本质区别
D. 一旦产生即表明感受器功能完成
E. 一般能真实反映外界刺激携带的信息
【单选题】
下列关于生物电的叙述，错误的是___
A. 感受器电位和突触后电位的幅度可随刺激强度的增加而增大
B. 感受器电位和突触后电位的幅度在产生部位较其周围大
C. 感受器电位和突触后电位均可以总和
D. 感受器电位和突触后电位的幅度比动作电位大
E. 感受器电位和突触后电位都是局部电位
【单选题】
不经过丘脑感觉接替核中继而传向大脑皮层的感觉是___
A. 视觉
B. 听觉
C. 前庭感觉
D. 嗅觉
E. 味觉
【单选题】
感觉的特异投射系统能引起特定感觉的主要原因是___
A. 发自丘脑特异感觉接替核
B. 中间不换元，直接投射到大脑皮层
C. 与大脑皮层有点对点的投射关系
D. 投射纤维主要终止于皮层的第四层
E. 很少受内环境理化因素的影响
【单选题】
下列选项中，符合非特异性感觉投射系统功能的是___
A. 产生某种特定的感觉
B. 维持和改变大脑皮质的兴奋状态
C. 激发大脑质层发出传出冲动
D. 参与形成躯体平衡感觉
E. 抑制大脑皮层的活动
【单选题】
感觉的非特异投射系统不能引起特定感觉的主要原因是___
A. 接受感觉传导路的侧支投射
B. 主要发自丘脑的髓板内核群
C. 进入大脑皮层各层结构
D. 通路失去感觉传入的专一性
E. 易受环境因素和药物的影响
【单选题】
关于皮层第一感觉区投射规律的叙述，正确的是___
A. 所有的纤维投射均交叉
B. 代表区大小与身体各部大小一致
C. 整个人体完全倒置性安排
D. 膝以下代表区位于半球内侧面
E. 前后按肢体近、远端顺序排列
【单选题】
中枢损伤最不易缺损的感觉是___
A. 本体感觉
B. 触压觉
C. 温度觉
D. 躯体痛
E. 内脏痛
【单选题】
内脏痛最主要的特点是___
A. 一般表现为锐痛
B. 潜伏期和持续时间长
C. 定位不准确
D. 伴有不愉快情绪
E. 伴有自主神经反应
【单选题】
下列关于牵涉痛的描述，正确的是___
A. 患病内脏周边区痛觉过敏眼现在
B. 为内脏痛必有的表现之一
C. 体表放射部位具有确定性
D. 体腔壁痛属于其特殊表现
E. 是疾病预后不良的征兆
【单选题】
与眼视近物所做的调节无关的反射活动是___
A. 双眼会聚
B. 晶状体变凸
C. 瞳孔对光反射
D. 瞳孔调节反射
E. 瞳孔缩小
【单选题】
在正常人眼，入射光线的折射主要发生在___
A. 角膜前表面
B. 角膜后表面
C. 晶状体前表面
D. 晶状体后表面
E. 玻璃体前表面
【单选题】
正常情况下列哪一种感受器最容易适应___
A. 肌梭
B. 伤害性感受器
C. 触觉感受器
D. 内胜化学感受器
E. 肺牵张感受器
【单选题】
当睫状肌收缩时，可引起的生理效应是___
A. 睫状小带紧张性增加
B. 角膜曲度增加
C. 瞳孔增大
D. 晶状体曲度增加
E. 眼轴会聚
【单选题】
老视发生的主要原因是___
A. 玻璃体透明度改变
B. 晶状体弹性减弱
C. 角膜透明度改变
D. 房水循环障碍
E. 晶状体浑浊
【单选题】
正常情况下，用手电筒灯光照射人左眼时出现的反射性反应是___
A. 左侧瞳孔缩小，右侧瞳孔不变
B. 右侧瞳孔缩小，左侧瞳孔不变
C. 左则瞳孔明显缩小，右侧瞳孔略有增大发喷排内实意
D. 左、右两侧瞳孔同等程度缩小
E. 生理意义是减少球面像差和色像差
【单选题】
视近物和远物均需眼进行调节的折光异常是___
A. 近视
B. 远视
C. 散光
D. 斜视
E. 复视
【单选题】
人眼的近点表示___
A. 视力
B. 眼的折光能力
C. 眼的调节能力
D. 视杆细胞的功能
E. 视锥细胞的功能
【单选题】
视网膜上形成生理盲点的部位是___
A. 视盘
B. 黄斑中央凹
C. 黄斑外环区
D. 中央凹外20°
E. 视网膜锯齿缘
【单选题】
与视锥细胞相比，视杆细胞的特点是___
A. 数量少
B. 对光敏感度高
C. 能产生色觉
D. 分能力强
E. 主要在昼光下起作用
【单选题】
视网膜中央凹对光的感受分辨力高，其主要原因是___
A. 感光色素含量高
B. 感光细胞的兴奋性高
C. 视觉传递呈单线联系
D. 感光色素处于合成状态
E. 视锥细胞外段呈圆锥状
【单选题】
参与构成视觉细胞内感光物质的维生素是___
A. 维生素D
B. 维生素A
C. 维生素B2
D. 维生素B
E. 维生素C
【单选题】
光线刺激视杆维胞可引起___
A. Na+内流增加和超极化
B. Na+内流增加和去极化
C. Na+内流减少和超极化
D. Na+内流减少和去极化
E. K+外流停止和去极化
【单选题】
下列关于视网膜上两种感光细胞的叙述错误的是___
A. 视杆细胞分布于视网膜周边部，而视锥细胞分布于中心部
B. 视杆细胞对光敏感度较视锥细胞低
C. 视杆细胞不能 分辨颜色，而视锥细胞能分辨颜色
D. 视杆细胞对被视物结构的分辨能力较视锥细胞低
E. 视杆细胞传入通路的会聚程度较视锥细胞高
【单选题】
关于国际标准视力表上1.0所表达的情况，正确的描述是___
A. 反映视网膜上任意一处的视力
B. 反映视角为1分角时的视力
C. 1.0表示以分角计的视角大
D. 相当十最小的视网膜像大小
E. 相当于一个感光细胞的平均直径
