姓怕券昏藤嚼芒敦寇护插吕琶
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起止时间:2020-02-25到2020-06-28
更新状态:已完结
第一周 词类（I）冠词、并列连接词、数词 单元测验一
1、 这台电压表/伏特计如此灵敏，可以测量出电压的微小变化。This is such ____ sensitive voltmeter that it can measure the slightest changes in voltage.
A:the
B:a
C:an
D:/
答案: a
2、 平均速度等于末速度的一半。The average velocity is about half ____ final velocity.
A:the
B:a
C:an
D:/
答案: the
3、 这个电路由电池、电阻器和电容器组成。This circuit consists of a battery, a resistor ____ a capacitor.
A:and
B:or
C:but
D:for
答案: and
4、 原子的中心，即原子核，包含了带正电荷的微粒，称为“质子”。The center, ____ nucleus, of an atom contains positively charged particles called protons.
A:and
B:or
C:but
D:for
答案: or
5、 读者学会这些基本概念很重要，否则后面内容的讨论理解起来会有困难。It is important for the reader to learn the basic concepts well, ____ the discussion of later topics will be difficult to understand.
A:and
B:or
C:but
D:for
答案: or
6、 这个电热器消耗的电能比那个电热器多三倍。This electric heater dissipates ____that one.
A:three times more energy than
B:four times as great energy as
C:five times as great energy as
D:three times as great energy as
答案: four times as great energy as
7、 月球的质量为地球的八十分之一。The mass of the moon is ____.
A:1/80 what the earth is
B:1/80 that of the earth
C:1/80 of the earth
D:1/80 the earth
答案: 1/80 that of the earth
8、 温度每上升一度，电容降低百万分之七百五。 The capacitance will decrease by _____ per each degree rise in temperature.
A:750 parts per million
B:750 parts in million
C:750 parts of a million
D:750 parts in 
答案: 750 parts per million
9、 从1970年至1974年间，晶体管收音机的产量增长了五倍。From 1970 to 1974, the production of transistor radios was increased ___.
A:five times
B:by a factor of 5
C:by a factor of 4
D:by a factor of 6
答案: by a factor of 6
10、 这个电源上的电流为零点零零几安。The current through the power supply is _.
A:a few hundredth an ampere
B:a few thousandth of a ampere
C:a few hundredths of an ampere
D:a few thousandths of an ampere
答案: a few thousandths of an ampere
11、 这两极之间的电压很小。____ voltage between the terminals is very small.
答案: The
分析：本题考查定冠词the的特指用法，必须使用定冠词the。
12、 关闭开关，电路中的电流就会消失。Turn the switch off ____ the current in the circuit will disappear.
答案: and
分析：本题考查祈使句 + and + 句子这一结构，表达条件与结果的逻辑关系。句子译为：关闭电源，该电路中的电流就会消失。
13、 月球的体积约为地球的四分之一。（请用“倍数/分数+the +名词”的结构将句子补充完整）The moon is about one-quarter _____ the earth.
答案: the size of
分析：本句采用的是“倍数/分数+the +n”的句型结构。
14、 通过改变VBE零点零几伏特，就能极大的改变基极电流。By varying VBE only _____, the base current（基极电流）can be changed significantly.
答案: (以下答案任选其一都对)a few hundredths of a volt;
several hundredths of a volt
分析：零点零几表达的是百分之几，是a few hundredths， 因为分子不是1，所以序数词的分母要加s的复数形式，其后加介词of 加带有不定冠词的单位名词。
15、 在这样的角速度的时候，物体的重量将会是在一个重力加速度环境下的四倍。At this angular speed, the weight of a body will be four times __ in 1g environment.
答案: what it is
分析：本句采用的是“倍数/分数+what从句”的句型结构。
第二周 词类（II）介词 单元测验二
1、 These transistor（晶体管） circuits can amplify（放大） voltage signals with minimum waveform distortion（波形失真）. 下划线介词短语充当_。
A:状语
B:定语
C:补语
D:表语
答案: 状语
2、 The sound-carrying medium may be matter in any state. 下划线介词短语充当_。
A:状语
B:补语
C:定语
D:表语
答案: 定语
3、 The resistance of the load （负载）is too high for the amplifier（放大器）. 前后两个下划线介词短语分别充当_。
A:定语……状语
B:定语……表语
C:补语……状语
D:补语……补语
答案: 定语……状语
4、 A circuit may be defined as a path for current flow. 前后两个下划线介词短语分别充当_。
A:状语……状语
B:定语……定语
C:补语……定语
D:补语……状语
答案: 补语……定语
5、 Alternating current（交流电） as a source of power has certain advantages over direct current（直流电）. 前后两个下划线介词短语分别充当_。
A:状语……状语
B:定语……定语
C:补语……定语
D:补语……状语
答案: 状语……状语
6、 _ further increasing quantum-well（量子阱） number, the increase of the emission energy（发射能量） becomes slow.
A:For
B:With
C:In
D:By
答案: With
7、 A simple approach _ expressing a function（函数） is shown _ Fig. 4-1.
A:of……by
B:of……in
C:to……by
D:to……in
答案: to……in
8、 _ this case the velocity of an object varies linearly （线性地） __ the time.
A:In……with
B:In……at
C:Under……with
D:Under……at
答案: In……with
9、 We can easily see from the definition （定义） of k _ the ratio of a force _ a length that the unit of elastic potential energy （弹性势能） is the same as the unit of work （功） .
A:by……with
B:by……to
C:as……with
D:as……to
答案: as……to
10、 The two balls move _ the opposite directions _ the same stress（应力）.
A:in……on
B:in……under
C:to……under
D:toward……at
答案: in……under
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