【名词&注释】
周期性(periodicity)、简谐振动(simple harmonic vibration)、机械波(mechanical wave)、机械振动(mechanical vibration)、简谐波(simple harmonic wave)、简谐运动(simple harmonic motion)、判断题
[单选题]子房上位有下位花和周位花2种情况。( )
A. 正确
B. 错误
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举一反三：
[单选题]若坡度从10°增大到15°，则a点的数值将
A. 增大
B. 减小
C. 先减小后增大
D. 先增大后减小
[单选题]I walked slowly through the market, where people all kinds of fruits and vegetables.I studied the prices carefully and bought what I needed.
A. sell
B. were selling
C. had sold
D. have sold
[多选题]下列关于简谐振动和简谐波的说法，正确的是
A. 媒质中质点振动的周期一定和相应的波的周期相等
B. 媒质中质点振动的速度一定和相应的波的波速相等
C. 波的传播方向一定和媒质中质点振动的方向一致
D. 横波的波峰与波谷在振动方向上的距离一定是质点振幅的两倍。
[单选题]What do we know about Olivetti ?
A. It produced the best typewriter in the word.
B. It designed the word’s first mainframe. computer.
C. It exported more typewriter than other computer.
D. It has five independent companies with its head office in lvrea.
[单选题]The silk thread found in the hair of an Egyptian mummy suggests that .
A. Egyptians had probably travelled to China to buy silk
B. trade along the Silk Road began earlier than once thought
C. historical research often achieves fascinating results
D. new light can now be thrown on ancient trading practices
[单选题]We can infer from the passage that the author ______________.
A. enjoyed grown-up tricks very much
B. 1oved poster competitions very much
C. felt surprised to win the competition
D. became wise and rich after the competition
[单选题]CPeople from East Asia tend to have more difficulty than those from Europe in distinguishing facial expressions--and a new report published online in Current Biology explains why.
A. Rachael Jack, University of Glasgow researcher, said that rather than scanning evenly
B. (均匀的) across a face as Westerners do, Easterners fix their attention on the eyes.
C. "We show that Easterners and Westerners look at different face features to read facial expressions," Jack said. "Westerners look at the eyes and the mouth in equal measure, whereas Easterners favor the eyes and neglect (忽略) the mouth."
D. According to Jack and her colleagues, the discovery shows that human communication of emotion is more complex than previously believed. As a result, facial expressions that had been considered universally recognizable cannot be used to reliably convey emotion in cross-cultural situations.
E. The researchers studied cultural differences in the recognition of facial expressions by recording the eye movements of 13 Western Caucasian and 13 East Asian people while they observed pictures of. expressive faces and put them into categories: happy, sad, surprised, fearful, disgusted, angry, or neutral. They compared how accurately participants read those facial expressions using their particular eye movement strategies.
F. It turned out that Easterners focused much greater attention on the eyes and made significantly more errors than did Westerners. "The cultural difference in eye movements that they show is probably a reflection of cultural difference in facial expressions," Jack said. "Our data suggest that whereas Westerners use the whole face to convey emotion, Easterners use the eyes more and mouth less."
G. In short, the data show that facial expressions are not universal signals of human emotion. From here on, examining how cultural factors have diversified these basic social skills will help our understanding of human emotion. Otherwise, when it comes to communicating emotions across cultures, Easterners and Westerners will find themselves lost in translation.
H. 66. The discovery shows that Westerners __
I. pay equal attention to the eyes and the mouth
J. consider facial expressions universally reliable
K. observe the eyes and the mouth in different ways
L. have more difficulty in recognizing facial expressions
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