[单项选择]A certain ear increased its average speed by 5 miles per hour in each successive 5-minute interval after the first interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval ？（）
A. 1.0
B. 1.5
C. 2.0
D. 2.5
E. 3.0

[单项选择]A certain ear increased its average speed by 5 miles per hour in each successive 5-minute interval after the first interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval ？（）
A. 1.0
B. 1.5
C. 2.0
D. 2.5
E. 3.0

[填空题]China is trying its best to speed up its (economy) ______ development.

[填空题]It is ____________(当物体加热时) that the average speed of molecules is increased.

[单项选择]Which country didn’t press Burma to speed up its reforms
A. Vietnam.
B. The Philippines.
C. Thailand.

[单项选择]

Sound moves from its source to the ear by wave like fluctuations in air pressure, something like the peaks and troughs or the lowest point of ocean waves. One way to keep from hearing sound is to use ear plugs. Another way is to cancel out the sound with anti-sound.
Using a noise maker controlled by a microprocessor, engineers have produced sound waves that are half a wavelength out of phase with those of the noise to be quieted--each peak is matched to a trough, and vice versa. Once the researchers have recorded the offending sound, a microprocessor calculates the amplitude and wavelength of sound that will cancel out the highest and lowest points of the noise. It then produces an electric current that is amplified and fed to a loudspeaker, which produces anti-sound and wipes out the noise. If the anti-sound goes out of synchronization, a microphone picks up the leftover sound and sends it back to the microprocessor, which changes the phase of the anti-sound just enough
A. the rising and falling of water in the ocean
B. the crests and valleys of mountain ranges
C. a flag waving in the air
D. a machine for measuring air pressure

[单项选择]Then by 2020 its average income will have risen to almost $13, 000 ( measured at purchasing-power parity), （）equivalent to Spain’s today.
A. roughly
B. respectively
C. readily
D. rarely

[单项选择]

Electronic communication, due to its speed and broadcasting ability, is fundamentally different from paper-based communication such as letters and memos. (51) the other person’s response time capability is (52) fast, email is more "conversational" than traditional methods of communication.
In a paper document, it is absolutely (53) to make everything completely clear and unambiguous because your audience may not have a chance to ask for (54) . With email documents, however, your (55) can ask question immediately. Email, therefore like conversational speech, tends to be much informal and more ambiguous.
This is not always bad. It might not be a (56) expenditure of energy to slave (57) a message, making sure that your spelling is (58) , your words eloquent, and that your grammar and punctuation are (59) reproach, if the point of the message is simply to inform the recipient that your are
A. status
B. position
C. situation
D. identity