扶余一中高一上册英语期末试卷及答案,栏目：高一英语试题大全,高一英语学习方法大全 ，http://www.jiaoyu880.com 。
When the signal light turns green， cars go. When you cross the street at a signal light， you should wait for the walk signal. Be sure to look carefully to the left， right and left again， before cr
ossing the street.
When the signal light turns yellow， car drivers should slow down and prepare to stop. You should not cross if the light is yellow. The light is about to turn red， and cars will enter the intersection(十字路口).
This signal is the WALK sign. It has a picture of a person walking instead of using the word WALK.
This signal is the DON’T WALK sign. It is part of the signal with the picture of a person walking. This is a picture of a red hand， meaning you should stop. You should wait to cross the street until the green picture of the person walking is showing.
Car drivers and bikers must come to a complete stop at STOP signs.
A yield sign means to slow down and be ready to stop. If there are pedestrians（行人）or vehicles in or nearing the intersection， you must stop. If there is no traffic in or nearing the intersection and it is safe， you may go through.
This sign means you are coming to a crosswalk. Car drivers and bikers must stop to allow people in the crosswalk to cross the street.
64．The passage is intended for .
A．car drivers B．skaters C．bikers D．pedestrians
65．If you see the sign 
while riding a bike， you are required to .
A．take the bike lane B．stop your bike
C．ride close to the right side of the road D．ride in the middle of the road
66．Which of the following signs has the same meaning as the sign
?
67．When the signal light turns yellow， cyclists .
A．can cross the road B．should walk across the road
C．should wait D．can enter the intersection
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Energy goes from one plant or animal to another. A food chain shows how this energy moves. Each time an animal gets eaten， its energy is passed onto the animal that eats it. The food chain is very important because it keeps the balance of nature. If one part of the food chain disappears， it can affect all the other plants and animals. Any threat to the food chain is a threat to the environment’s biodiversity（生物多样性）. The food chain helps keep animal populations in balance. However， if something happens to increase or decrease one of the links in the food chain， that balance is broken. If one animal becomes endangered， it puts all the animals above it at risk.
Some of the threats are natural， such as wildfires， hurricanes， tornados， floods and so on. But the biggest threats to the food chain come from you and me. These threats include overhunting， overfishing， logging， farming， development， pollution， etc. The food chain is endangered anywhere humans have had an effect on the natural environment.
A recent study shows that the overfishing of large sharks is damaging the food chain along the US Atlantic coast. Canadian and American scientists say sharks are being killed in great numbers for their meat and fins（鳍）. Now， not enough sharks are around to eat the cownose（牛鼻）ray. The ray’s population has increased and they have eaten up the shellfish to the point where it has hurt commercial（商业的）fishing.
Many of us disturb the natural environment in our own backyards. It’s up to us to take care of the environment and try not to disrupt the natural food chain. If we don’t act responsibly， animals will start disappearing.
68．What can we learn from Paragraph 1?
A．The food chain is not easy to be broken.
B．The energy of an animal usually disappears when it dies.
C．Increasing the links will not break the balance of nature.
D．Breaking the food chain is bad for the biodiversity of the environment.
69．The study mentioned in Paragraph 3 proves that .
A．human activities can be a big threat to the food chain
B．we are all responsible for the breaking of the food chain
C．natural disasters are hard to break the food chain
D．hunting large sharks for meat is beneficial
70．We can infer that the writer wrote this passage mainly to .
A．explain what the food chain is
B．tell us something interesting about Nature
C．suggest that we stop eating meat to save animals
D．suggest that we not disrupt the natural food chain
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