【名词&注释】
一氧化碳(carbon monoxide)、混合气体(mixed gas)、印刷术(printing)、四大发明(four great inventions)、指南针(compass)、造纸术(papermaking technique)、澄清石灰水
[判断题]指南针、造纸术(papermaking technique)、印刷术和火药，是我国古代人民的“四大发明”，其中发明最早的是指南针。（ ）
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举一反三：
[单选题]30． —What did the teacher say just now?—Sorry． I didn't catch it． I __________something else．
A. think
B. will think
C. was thinking
D. had thought
[单选题]BJack is a famous writer now．But he said he was not a good student when he was young．He was often late for class and didn’t like doing his homework． Sometimes he slept in class while the teacher was teaching．He didn't understand much, but he always thought he under-stood everything．．
A. John is fifteen now and how old is his brother?" Jack answered, "That's easy． His brother is twice as old as John, so he is now thirty． "
B. see our eyes are in front of our ears?"
C. The third time, the teacher in a biology class asked, "Why can fish swim in the water?" "But, Miss White," said Jack quickly, "don't you know fish can-t walk on land?"
D. Jack was not ________． when he was young．
E. strong
F. lazy
G. clever
H. well
[单选题]某气体由氢气、一氧化碳、甲烷中的一种或几种组成。点燃该气体后，在火焰上方罩一冷而干燥的烧杯，烧杯内壁出现水雾；把烧杯迅速倒转过来，注入少量澄清石灰水，振荡，石灰水变混浊。下列对气体组成的推断不正确的是
A. 可能三种气体都存在
B. 可能只有氢气
C. 可能是甲烷和一氧化碳的混合气体
D. 可能只有甲烷
[单选题]22． Mary got _______on her birthday．
A. pants
B. a dinner
C. a cookbook
D. a concert ticket
[单选题]AThe undersea world is very beautiful． Now more and more people want to dive in the water to find the secrets there． Scuba diving is a new sport today． It can take you into a wonder-ful undersea world．
A. Some are as large as a school bus． Many sea animals give out light in the dark and some have sharp teeth．During the day， there is enough light． Here， under the sea， everything is blue and green．When fish swim nearby， you can catch them with your hands． When you have bottles of air on your back， you can stay in deep water for a long time． However， you can-t dive too deep． And you must be very careful when you dive in deep water．The deep sea is not an easy place to live in． It-s cold， and it，s dark， too． The deeper it is， the less sunlight there is． At about 3，000 feet， there is no light at all． It is very dark in the sea． Many fishes have no eyes． Some have big eyes． A few have eyes on one side． Besides the cold and the darkness， deep-sea animals face a third danger-other animals．
B. Many animals eat plants． However， some am-mals eat meat． This means these sea animals have two big jobs． They need to find animals as food， and they have to try not to become other animals' meal．
C. Why do people want to dive in the sea? Because ________ ．
D. they want to catch fish
E. they want to find the secrets of the undersea world
F. the sea is deep
G. D， there are all kinds of plants in the sea
[单选题]41． —1 hear _________ your grandpa _________ your grandma like watching Min Opera．
—Right，just as many old people do in Fuzhou．
A. both，and
B. either，or
C. neither，nor
D. not only，but also
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