What does the author want to convey through this passage?
How much did the cost of paper increase between 1975 and 1990? _______.
Newspapers will continue to change, but as an effective means of distributing information, they______.
Ibelievethat______(别人在那种情况下也会像我那么做的).
Mrs. Smith shut the windows lest________(外面的噪音会影响她儿子的睡眠)
The greater the population there is in a locality, _____________. (其对水、效能和垃圾处理的需求就会越大)