What was special in their recorded sounds?
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A they are heated to high temperatures B bacteria cannot always affect us and cause disease C they were put into freezers D they can hardly be seen E bacteria cannot produce disgusting smell or change the nature of the food F only some bacteria can cause disease.
2 .Because of the protection of our immune system, _____.
A they are heated to high temperatures B bacteria cannot always affect us and cause disease C they were put into freezers D they can hardly be seen E bacteria cannot produce disgusting smell or change the nature of the food F only some bacteria can cause disease.
3 .The following is commonly known EXCEPT______.
A Megalodon, the largest shark, is extinct. B Megalodon is not extinct but just out of reach C Megalodon was 52 feet long and had a jaw 7 or more feet wide D Megalodon lived between several million years ago
4 .What makes scientists doubt about the belief that Megalodon is extinct?
A The discovery of may “Living Fossils”. B The discovery of the fossils of lobsters. C The discovery of a live Coelacanth. D The discovery of the fossils of sea urchins.
5 .U.S. Navy set up underwater microphones around the world______.
A To listen for changes in ocean structure B To listen for changes of ocean currents or volcanic activity C To make sure whether there was a giant squid deep in the ocean D To follow the track of the Soviet warships under water
7 .What can be concluded from the passage?
A Scientists’ discoveries always change people’s belief. B There are too many secrets to be discovered. C Megalodon may be still alive deep in the ocean. D “Deep sound channel” allows sound waves to travel undisturbed.
8 .Which statement is the best description of the first paragraph?
A Farming plays an important role in US. B American people consider their agriculture products are very important. C The US farming has a leading position in the world. D American farmers feed American people and other people in the world.
9 .Which of the following statements about the American Agriculture is NOT TRUE according to the second paragraph?
A The black top soil will completely be blown or washed away in 80 years. B 50 years later, corn and soybean yields in the Midwest may drop 30%. C In 1830, nearly two feet of rich, black top soil covered the Midwest. D This erosion is steadily decreasing the productivity of valuable cropland.
10 .Which is not the result of using fertilizers on fields?
A Decreasing crop yields B Devastating for ecology C Compensating for the loss of fertile topsoil D Polluting the nation’s precious water supply.
