题目内容

11（）

A. available
B. enough
C. sufficient
D. convenient

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Write a note of about 50 - 60 words based on the following situation:You’ve learned that your friend Jimmy is ill these days. Write him a note expressing your concern, asking after his health and giving your best wishes.Marks will be awarded for content, organization, grammar and appropriacy.

6（）

A. for
B. of
C. on
D. at

Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of （） . This, in turn, limits the data rate that can be carried on the transmission （） . A square wave has an infinite number of frequency components and hence an infinite （） .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the （） in this waveform is in the first few frequency components. In general, any digital waveform will have （） bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted. This, in turn, limits the data rate that can be carried on the transmission（）

A. procedures
B. function
C. route
D. medium

Jane thinks that Swiss cheese（）

A. tastes the best.
B. tastes very bad.
C. is better than butter cheese.
D. is no better than other cheese.