A. How space research benefits people on Earth. B. When the International Space Station was built. C. How many space shuttle missions there will be. D. When America's earliest space program started.
A. They tried to make best use of the latest technology. B. They tried to meet astronauts' specific requirements. C. They developed objects for astronauts to use in outer space. D. They accurately calculated the speed of the orbiting shuttles.
A. They are expensive to make. B. They are extremely accurate. C. They were first made in space. D. They were invented in the 1970s.
A. Everything was natural and genuine then. B. People had plenty of land to cultivate then. C. It marked the beginning of something new. D. It was when her ancestors came to America.
A. They were known to be creative. B. They enjoyed living a living a life of ease. C. They had all kinds of entertainment. D. They believed in working for goals.
A. Chatting with her ancestors. B. Doing needlework by the fire C. Furnishing her country house. D. Polishing all the silver work.
A. Sit down and try to calm yourself B. Call your family or friends for help C. Use a map to identify your location. D. Try to follow your footprints back.
A. You may end up entering a wonderland. B. You may get drowned in a sudden flood. C. You may expose yourself to unexpected dangers. D. You may find a way out without your knowing it.
A. Wait patiently. B. Look for food C. Start a fire. D. Walk uphill.
A. Check the local weather. B. Find a map and a compass. C. Prepare enough food and drink. D. Inform somebody of your plan.
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