7．How did ancient people tell time？
◆Natural ways of keeping time
In ancient time，people had to use the sun and the moon to tell time．They got up when the sun came up and worked in the fields until the sun went down．
◆Man-made things
The sand clock is made of two glass balls joined by a narrow neck．The top ball was filled with sand．The sand slowly moved through the neck into the bottom（底部） ball．People knew the time by watching how much sand fell to the bottom ball．People also made the water clock．They made a small hole near the bottom of a pot．When the water in the pot dripped（滴） out，marking（刻度） inside the pot showed how much time passed．
◆Body clocks in living things
Animals'body clock
Animals don't need clocks to know time．They have their body clocks．Birds know when to fly to warmer places before winter．Some animals know when to keep more food for the winter．Some fish know when it's time to move up the river and lay eggs．
Plants'own clock
Plants have their own clocks to keep time．Plants know when to open flowers or when to drop their leaves．
Body clock in human beings
People also have their own body clocks．When we get used to our lives，our body clocks can be very exact．It can tell us when it's time to wake up．It can also tell us when to eat or to go to sleep．
74．How could an ancient farmer know when to go back home from the field in the daytime？C
A．By looking at the moon
B．By the sand clock or the water clock
C．By looking at the sun
D．By feeling whether tired or not
75．According to the passage，how can animals know time？A
A．They use body clocks
B．They ask other animals
C．They use the sun and the moon
D．They make something to tell time
76．How many kinds of living things with body clocks are mentioned（提到） here？B
A．Two
B．Three
C．Four
D．Six
77．In what way is the sand clock the same as the water clock in telling time？D
A．Both of them have a neck
B．Both of them have two glass balls
C．Both of them can be used only once
D．Both of them give the time by quantity（數(shù)量）
78．The passage is mainly aboutC．
A．man-made clocks
B．nature's clocks
C．time and clock
D．how people keep time．
分析 短文講了確定時(shí)間的一些方法，具體的介紹了它們的原理等．
解答 答案：74．C 細(xì)節(jié)理解題．根據(jù)第三行句子In ancient time，people had to use the sun and the moon to tell time．They got up when the sun came up and worked in the fields until the sun went down．在古代，人們不得不利用太陽和月亮來報(bào)時(shí)，他們在太陽升起的時(shí)候起床，在地里干活，直到太陽下山．可知是通過看太陽．故選C．
75．A 細(xì)節(jié)理解題．根據(jù)倒數(shù)第六行句子Animals don't need clocks to know time．They have their body clocks．動(dòng)物不需要時(shí)鐘來了解時(shí)間．它們有自己的生物鐘．可知他們通過生物鐘．故選A．
76．B 細(xì)節(jié)歸納題．根據(jù)整篇文章內(nèi)容及其句子Animals'body clock，動(dòng)物的生物鐘．Plants'own clock植物自身的時(shí)鐘．Body clock in human beings．人的生物鐘．可知有三種．故選B．
77．D 細(xì)節(jié)理解題．根據(jù)第六行句子People knew the time by watching how much sand fell to the bottom ball．人們通過觀察沙子落在底部球上的數(shù)量來確定時(shí)間．When the water in the pot dripped（滴） out，marking（刻度） inside the pot showed how much time passed．當(dāng)壺里的水滴出來時(shí)，罐子里的痕跡顯示出多少時(shí)間過去了．可知它們都是按數(shù)量來確定時(shí)間的．故選D．
78．C 主旨?xì)w納題．根據(jù)整篇文章內(nèi)容及其句子How did ancient people tell time？古代人們是怎么確定時(shí)間的？和Natural ways of keeping time．自然保持時(shí)間的方法．Man-made things．人造物品．Body clocks in living things．．生物中的生物鐘．可知文章主要說的是時(shí)間和時(shí)鐘．故選C．
點(diǎn)評 在通讀全文的基礎(chǔ)上，根據(jù)全文大意，展開邏輯思維，瞻前顧后，認(rèn)真觀察選項(xiàng)，仔細(xì)推敲，確定最佳答案．
