第二节完形填空（共20小题，每小题1分，满分20分）阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。
What will the city of the future look like? No one knows for sure, and (26) ____________ (make) predictions is a risky business. But one thing is certain—they are going to get bigger before they get smaller. In the future, care for the environment will become very important as earth’s natural (27)____________ (resource) run out. We will use lots of (28) ____________       (recycle) materials, such as plastic, aluminium, steel, glass, wood and paper, and we will waste fewer natural resources. We will also have to rely more (29) ____________ alternative energy, such as solar and wind power. All this seems certain, (30) ____________ there are plenty of things about city life in the future which are not certain.
B
Public transport (31) ____________ (provide) a cheap way to get around in Beijing. There are 20,000 buses and (32) ____________ (trolleybus) in Beijing, but they can get very (33) ____________ (crowd). It’s a good idea to avoid public transport during the (34) ____________ hour (6：30 am - 8：00 am and 5：00 pm - 6：30 pm). Fares are cheap, (35) ____________ (start) at 1 yuan.  Air-conditioned buses cost more.
C
We use “learned” body language when we are (36) ____________ (introduce) to strangers. Like other animals, we are on guard until we know it is safe to (37) ____________ (relax). So every culture has developed a formal way to greet strangers, to show them we are not (38) ____________ (aggress). Traditionally, Europeans and Americans shake hands. They do this with the right hand—the (39) ____________ (strong) hand for most people. If our right hand is busy (40) ____________ (greet) someone, it cannot be holding a weapon.
D
We left the docks (41) ____________ a beautiful afternoon. The sun was shining (42) ____________ (bright) as we sailed downstream through a hilly region. Men (43) ____________ (ride) bamboo rafts along the river’s edge and coal boats went past. As the sun set we docked at Fengdu. We could see the sun (44) ____________ (set) behind the white pagoda. It was beautiful.
We slept through the first gorge, (45) ____________ is called the Qutang Gorge.