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【C16】
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To find out what the weather is going to be, most people go directly to the television, the radio or newspaper to get a weather forecast. But【C1】______you know what to look for, you can use your own【C2】______to make weather predictions.
There are many【C3】______which can help you. For example, in fair weather the air pressure is generally【C4】______. The air is still and often full of dust. Faraway objects may look【C5】______. But when a storm is gathering, the pressure【C6】______and you are often able to see things【C7】______clearly. Sailors took note of this long ago and came【C8】______with a saying "The farther the sight, the nearer the rain."
Your sense of【C9】______can also help you find weather changes. Just【C10】______it rains, odours become stronger. This is【C11】______odours are suppressed in a fair, high-pressure center. When a bad weather low moves【C12】______, air pressure lessens and odours are【C13】______.
You can also hear a(n)【C14】______storm. An old saying【C15】______it this way: "Sound travelling far and wide, a stormy day will betide."
And don't【C16】______if your grandfather says he can【C17】______a storm coming. It is commonly known【C18】______many people feel pains in their bones when the humidity【C19】______, the pressure drops, and bad weather is on the【C20】______.
【C1】
It is hard to track the blue whale, the ocean's largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of
the Navy's formerly top-secret system of underwater listening devices spanning the oceans.
Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.
Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption (爆发) for the first time and that they plan similar studies.
Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures.
The speed of sound in water is roughly one mile a second-slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient's chest to a doctor's ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
The passage is chiefly about______ .
听力原文：W: Where do you spend your weekend？ For me, movies and restaurants are good places to enjoy myself.
M: That's expensive to me. I'd like to go to party with my friends.
What does the man prefer to do on weekend？
How is the water around the edges of the continents？
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