To find out what the weather is going to he, most people go straight to the radio, television or newspaper to get an expert weather forecast. But if you know what to look for, you can use your own senses to make weather predictions.
There are many signs which can help you. For example, in fair weather the air pressure is generally high. The air is still and often full of dust. Faraway objects may look hazy. But when a storm is brewing, the pressure drops and you are often able to see things more clearly. Sailors took note of this long ago and came up with a saying "The farther the sight, the nearer the rain."
Your sense of smell can also help you detect weather changes. Just before it rains, odors become stronger. This is because odors are repressed in a fair, high-pressure center. When a bad weather low moves in, air pressure lessens and odors are released.
You can also hear an approaching storm. Sounds bounce off heavy storm clouds and return to earth with increased force. An old saying describes it this way: "Sounds traveling far and wide, a storm day will betide."
And don’t scoff if your grandmother says she can feel a storm coming. It is commonly known that many people feel pains in their bones or in corns and bunions when the humidity rises, the pressure drops, and bad weather is on the way.

A:the idea of feeling a coming storm is foolish B:older people know a lot about weather C:it is possible, but unlikely, that people feel aches when a storm is coming D:it is definitely true that some people can feel coming weather changes

B
Unless we spend money spotting and preventing asteroids now, one might crash into Earth and destroy life as we know, say some scientists.
Asteroids are different forms of the meteoroids that race across the night sky. Most orbits the sun far from Earth and don’t threaten us. But there are also thousands of asteroids whose orbits put them on a violent coming course together with Earth.
Buy $ 50 million worth of new telescopes right now. Then spend $10 mil]ion a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we’ll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn’t be cheap.
Is it worth it Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think asteroids big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare but if one did fall it would be the end of the world. "If we don’t take care of these big asteroids, they’ll take care of us. "Says one scientist. "Its that simple."
The cure, though, might be worse than the disease, Do we really want fleets of nuclear weapons silting around on Earth "The world has less to fear from doomsday rocks than from a great nuclear fleet set against them. "Said a New York Times article.

A:Violent coming courses of smaller asteroids with earth take place often than expected. B:It's still too early to say whether such a violent coming course might happen. C:Such a violent coming course might happen once every 25 years. D:It is very unlikely but the danger exists.

It was Sunday. The trains were crowded. A gentleman was walking along the platform (21) a place. In one of (22) he saw a vacant seat. But a small suitcase was (23) on it and a stout gentleman was sitting next to it. "Is this seat vacant" asked the gentleman. "No, it is my (24) " answered the stout gentleman. He is just coming. This is his suitcase. "Well," said the gentleman, "I will sit here till he (25) . "Five minutes later, the train started, (26) nobody came. "Your friend is late, "said the gentleman," He (27) his train, but he need not (28) suitcase. "And (29) these words he (30) the case and threw it out of the window. The stout gentleman jumped up to catch the case but it was too late. He regretted taking two seats for his own comfort.

A:will come B:is coming C:come D:comes

It was Sunday. The trains were crowded. A gentleman was walking along the platform (21) a place. In one of (22) he saw a vacant seat. But a small suitcase was (23) on it and a stout gentleman was sitting next to it. "Is this seat vacant" asked the gentleman. "No, it is my (24) . " answered the stout gentleman. He is just coming. This is his suitcase. "Well," said the gentleman, "I will sit here till he (25) ." Five minutes later, the train started, (26) nobody came. "Your friend is late," said the gentleman, "He (27) his train, but he need not (28) suitcase. " And (29) these words he (30) the case and threw it out of the window. The stout gentleman jumped up to catch the case but it was too late. He regretted taking two seats for his own comfort.

A:will come B:is coming C:come D:comes

It was Sunday. The trains were crowded. A gentleman was walking along the platform (21) a place. In one of (22) he saw a vacant seat. But a small suitcase was (23) on it and a stout gentleman was sitting next to it. "Is this seat vacant" asked the gentleman. "No, it is my (24) " answered the stout gentleman. He is just coming. This is his suitcase. "Well," said the gentleman, "I will sit here till he (25) . "Five minutes later, the train started, (26) nobody came. "Your friend is late, "said the gentleman," He (27) his train, but he need not (28) suitcase. "And (29) these words he (30) the case and threw it out of the window. The stout gentleman jumped up to catch the case but it was too late. He regretted taking two seats for his own comfort.

A:will come B:is coming C:come D:comes

It was Sunday. The trains were crowded. A gentleman was walking along the platform (21) a place. In one of (22) he saw a vacant seat. But a small suitcase was (23) on it and a stout gentleman was sitting next to it. "Is this seat vacant" asked the gentleman. "No, it is my (24) . " answered the stout gentleman. He is just coming. This is his suitcase. "Well," said the gentleman, "I will sit here till he (25) ." Five minutes later, the train started, (26) nobody came. "Your friend is late," said the gentleman, "He (27) his train, but he need not (28) suitcase. " And (29) these words he (30) the case and threw it out of the window. The stout gentleman jumped up to catch the case but it was too late. He regretted taking two seats for his own comfort.

A:will come B:is coming C:come D:comes

What do scientists say about the violent coming course of an asteroid with the earth

A:Violent coming courses of smaller asteroids with earth take place often than expected. B:It's still too early to say whether such a violent coming course might happen. C:Such a violent coming course might happen once every 25 years. D:It is very unlikely but the danger exists.

The phrase "coming back out of the cave" in the fifth paragraph means

A:"coming back home". B:"giving up the present job". C:"living a luxurious life". D:"restoring real human contact".

The most widespread fallacy (谬误) of all is that colds are caused by cold. They are not. They are caused by viruses passage on from person to person. You catch a cold by coming into contact, directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them permanently. But they do not. And in isolated arctic regions explorers have the outside world by way of packages and mail dropped from airplanes.
Arctic explorers may catch colds when

A:they are working in the isolated arctic regions. B:they are writing reports in terribly cold weather. C:they are free from work in the isolated arctic regions. D:they are coming into contact with the outside worl