19.Yao Ming is very good.He was taller than ___ in his grade

19.Yao Ming is very good.He was taller than ___ in his grade that year.
A.any one
B.the one
C.other students
D.any one else
满分：4 分
20.In ancient times wealth was measured and exchanged in things that could be touched:food,tools,and precious metals and stones.Then the barter system was replaced by coins,which still had real value since they were pieces of rare metal.Coins were followed by fiat money,paper notes that have value only because everyone agrees to accept them.Today electronic monetary systems are gradually being introduced that will transform money into even less tangible forms,reducing it to a series of “bits and bytes”,or units of computerized information,going between machines at the speed of light.Already,electronic fund transfer allows money to be instantly sent and received by different banks,companies,and countries through computers and telecommunications devices.According to the passage,coins once had real value as currency because they ___.
A.represented a great improvement over barter
B.permitted easy transportation of wealth
C.were made of precious metals
D.could become collector’s itemscould become collector’s items
满分：4 分
21.Eating in space is different from eating on earth.The food that astronauts carry with them does not look like the food you eat.Some food is carried in closed bags.It is cooked and frozen before the astronauts get it.All the water is removed from the food.In the spaceship the astronaut puts the water back.He “shoots” hot or cold water into the food bag with a special gun.He eats the food through a small hole in the bag.Other foods come in bite sizes.The astronaut puts a whole piece in his mouth at once.There are no crumbs.Crumbs would float around the spaceship and get in the way.Meat and cake often come in bite-sized pieces.Astronauts can’t drink water from open cups.The water would float in drops in the air.The water is put in the special gun.The astronaut shoots the water into his mouth.Eating in space is not easy.Astronauts must learn to eat this way.Which of the following does the story lead you to believe?
A.Food for astronauts must be made in a special way
B.All meat on earth comes in bite-sized pieces.
C.Astronauts will only eat cakes made from crumbs
D.Astronauts have to go hungry in a spaceship

19 D 20 B 21 A 兄弟不简单啊 打这老多字