产生了极大的影响，因此，城市森林可能受到损害，这也可能对人和环境产生不利影响。故选C。

4．What would be the best title for the text?

A．The Importance of the Urban Trees

B．How to Protect the Urban Trees

C．Urban Trees Are in Great Danger

D．Let's Act for the Protection of Urban Trees

【答案】　D　标题判断题。本文主要介绍了城市中的森林使城市宜居，但是人类的活动对城市的树木产生了极大的影响，所以我们应该为保护城市树木采取行动。故选D。

B

(2018·天津D)Give yourself a test. Which way is the wind blowing？How many kinds of wildflowers can be seen from your front door？If your awareness is as sharp as it could be，you'll have no trouble answering these questions.

Most of us observed much more as children than we do as adults. A child's day is filled with fascination，newness and wonder. Curiosity gave us all a natural awareness. But distinctions that were sharp to us as children become unclear；we are numb(麻木的)to new stimulation(刺激)，new ideas. Relearning the art of seeing the world around us is quite simple，although it takes practice and requires breaking some bad habits.

The first step in awakening senses is to stop predicting what we are going to see and feel before it occurs. This blocks awareness. One chilly night when I was hiking in the Rocky Mountains with some students，I mentioned that we were going to cross a mountain stream. The students began complaining about how cold it would be. We reached the stream，and they unwillingly walked ahead. They were almost knee－deep when they realized it was a hot spring. Later they all admitted they'd felt cold water at first.

Another block to awareness is the obsession(痴迷)many of us have with naming things. I saw bird watchers who spotted a bird，immediately looked it up in field