【推荐1】Do you know astronauts’ everyday life in space? They also need to eat, _________, exercise and relax. They do the same thing as us, but they do them _________.

On the earth, we put food on a plate and put _________ in a glass. Gravity (重力) holds the food down and keeps the water in the glass. There is almost no gravity in space and food can fly away, _________ astronauts must eat and drink carefully.

Sleeping is very different in space. Some astronauts like to float (漂浮) in the air, but most say _________ they like to be in a sleeping bag. They tie (系) the bag to a wall so that they won’t float away at night.

Exercise is very important in space. On the earth, your legs carry your body, _________ in space, astronauts float, so they do not use _________ legs often. This is very bad _________ their legs, so they must exercise for thirty minutes every day.

After a day’s work, astronauts can’t wait _________. They may listen to music, read, watch films, play games, or __________ a few minutes talking to their friends and family on the radio. Sometimes they only enjoy floating in the air.

【推荐2】The Americans were getting ready to send their first man to the moon. An old Irishman (爱尔兰人) was watching them on the television in the bar of a hotel. There was an Englishman in the bar, too, and he ______ the Irishman, “The ______ are very clever, aren't they? They are going ______ some men to the moon. It is a long ______ from the earth.”

“Oh, that's ______, ”the Irishman answered quickly. “The Irish are going to send some men to the sun in a few months. That's ______ away than the moon, you know.”

“Yes, it is,” the Englishman said, “______ it is too ______ for the people to go to.”

The Irishman laughed and said, “Well, the Irish aren't stupid, you know. We ______ go to the sun during the day, of course. We will go there ______. ”

【推荐3】The first astronauts(宇航员)

Since the earliest times, people have looked up at the stars, the moon and the planets. Today people use modern machines_______at the sky. This is very different from the situation_______years ago when people could only use their eyes. Perhaps they dreamed of _______   the universe. When did humans first go into space? The story began not so very long ago,_______the firstastronauts were not people-they were animals. Scientists wanted to make travelling to space as _______as possible for humans. So they decided to experiment with animals and test_______in spaceflights. Insects, mice, frogs, dogs and monkeys were some of the animals_______first went into space. Many of them_______, but they helped to make space travel safer for humans. For their great service, we _______forget these animals. Albert I was the first monkey to go into space in 1949. Sadly he died________   his space ship landed back on Earth.

【推荐2】We sometimes call the lion “the king of the jungle（丛林）” because it is stronger and more dangerous than other animals. It can _______ faster than many animals and it can hunt the best. It is the highest animal in the land’s food chain.

In the sea, the shark（鲨鱼）is one of the animals at the _______ of the food chain. It can swim faster than _______ other sea animal, and it can use its big teeth to eat them.

What is at the top of the world’s food chain?

_______! We are not the biggest or fastest. We could not run faster than cheetahs（猎豹）, so we _______ planes and now we can move the fastest. We could not fight _______ than lions, so we invented guns. Now we can hunt the best.

People’s inventions are great, but they can be _______ too. For example, man built _______ and now they make the air and rivers dirty. This can make terrible changes. Dirty rivers kill fish. Then bears cannot eat the fish and the bears die. If we kill one part of the food chain, _______ also die. Remember that we are a part of the food chain,

If we protect animals, we are protecting ________!