問題詳情：
Swimming can be as peaceful as it is fun. Underwater，no one can tell you to do your homework or clean your ything sounds soft，quiet and peaceful.
However，to the ears of a whale or dolphin，the underwater world is getting less peaceful all the ges around them are making the ocean noisier. For example，noisy ships are more common than they used to be. Sound travels faster and farther underwater than it does in air. In some cases，a single sound can travel all the way across the deep ocean. For underwater animals，it's like having new neighbors who play loud music all the time，even at night. The noise can hurt animals' ears. It can make life more worrying for them. It can influence their behavior，where they go and maybe even how they talk to each other.
With noisier oceans，scientists are more concerned about the mammals in the ocean such as whales，dolphins and sea lions. These animals depend on sound to communicate with each other. For example，an animal sends out sounds and then listens for echoes(回聲)．By reading the time it takes for those sounds to come back，the animal can know the distance to things that are around. But sound isn't just getting into the ocean more than it used to. It's also traveling longer distances. That is caused by a gas called carbon dioxide(CO2)．Many human activities－－including driving cars and heating homes—give off CO2 into the 2 is a greenhouse gas. It also gets into the oceans. And CO2rich water allows noises to travel farther，makes the underwater world even noisier than before，and even makes it harder for whales and other animals to hear each other.
32. The underwater world becomes less peaceful because________.
A．there are more underwater animals than before
B．environmental changes make the ocean noisier
C．people play loud music when traveling by ship
D．ships are much larger and travel faster than before
33．The underwater noise can do all the following EXCEPT________.
A．change underwater animals' behavior
B．make underwater animals' life more worrying
C．make underwater animals unable to communicate
D．have a bad effect on underwater animals' ears
34．We can infer from the passage that________.
A．we should limit humans' underwater activities
B．less sound is getting into the ocean than before
C．CO2rich water may stop noises from traveling farther
D．the ocean may get more peaceful if people live a lowcarbon life
35．Which of the following might be the best title for the passage?
A．Underwater Noise B．Sounds and Echoes
C．Underwater Animals D．Swimming in the Ocean
【回答】
BCDA
知識點：*經濟文化類閱讀
題型：閱讀理解
