题目内容
19．According to some doctors，one of the ways to prevent us from growing old is to make surethat our brains get enough___．（ ）
| A． | performance | B． | exercise | C． | experience | D． | sport |
分析 据一些医生所说，延缓衰老的方法之一是确保我们大脑得到足够的锻炼．
解答 答案：B．A．performance表演、执行；B．exercise运动，锻炼；C．experience经验；D．sport有"运动"的意思，但它指的是体育运动．篮球足球这类运动可以用sport．结合句意"据一些医生所说，延缓衰老的方法之一是确保我们大脑得到足够的锻炼．"可知，exercise符合题意，故选B．
点评 本题考查名词的词义辨析．词汇辨析题首先要掌握各个选项的词义、固定搭配、用法，然后再根据句意，结合语境，选出正确答案．
练习册系列答案
相关题目
9．
Big climate changes in the last million years might have come from something very small dust from outer space．
Earth changes between ice ages and warm periods in a（n） （41）Cthat includes several cycles，including a （42）H one that lasts 100，000years．Scientists （43）Asuggested this cycle might be due to changes in the inflow of cosmic（宇宙） dust．
The idea is that Earth （44）Eabove and below the imaginary planet that runs through the sun and Jupiter（木星），completing a cycle every 100，000years．So maybe it encounters （45）Gvarying amounts of dust during each cycle that produce the climate trend．
Now there is some （46）J，from ancient cosmic dust recovered in ocean-floor drilling near the Azores islands west of Portugal．The large quantity of the dust rises and falls with a wonderful 100，000year cycle during the period analyzed，253，000years to 458，000years ago．Periods of more dust are related to（47）F climates．
But that is a long way from showing that the dust （48）Bclimate．Some scientists argue that it is not clear how cosmic dust would make the climate warmer while dust from volcanoes is known to make it cooler．They say the cosmic dust is so thin that it is hard to see how it could have any climate（49）I．
Nevertheless，the new study shows scientists have to take the cosmic dust idea seriously．
| A．recently B．affects C．pattern D．varied E．floats F．warm G．regularly H．mysterious I．effect J．evidence |
Earth changes between ice ages and warm periods in a（n） （41）Cthat includes several cycles，including a （42）H one that lasts 100，000years．Scientists （43）Asuggested this cycle might be due to changes in the inflow of cosmic（宇宙） dust．
The idea is that Earth （44）Eabove and below the imaginary planet that runs through the sun and Jupiter（木星），completing a cycle every 100，000years．So maybe it encounters （45）Gvarying amounts of dust during each cycle that produce the climate trend．
Now there is some （46）J，from ancient cosmic dust recovered in ocean-floor drilling near the Azores islands west of Portugal．The large quantity of the dust rises and falls with a wonderful 100，000year cycle during the period analyzed，253，000years to 458，000years ago．Periods of more dust are related to（47）F climates．
But that is a long way from showing that the dust （48）Bclimate．Some scientists argue that it is not clear how cosmic dust would make the climate warmer while dust from volcanoes is known to make it cooler．They say the cosmic dust is so thin that it is hard to see how it could have any climate（49）I．
Nevertheless，the new study shows scientists have to take the cosmic dust idea seriously．
10．______almost one hundred jin，the stone was moved by him alone．（ ）
| A． | Weighed | B． | Weighing | C． | It weighed | D． | To weigh |
7．-The map will be of help？
-Take it with you you get lost in the forest．（ ）
-Take it with you you get lost in the forest．（ ）
| A． | so that | B． | even if | C． | as long as | D． | in case |
14．China and the United States held their first strategic dialogue on August and ______to increase co-operation and constructive relations．（ ）
| A． | agreed | B． | would agree | C． | have agreed | D． | had agreed |
4．____ that caused him to serve dinner an hour later than usual．（ ）
| A． | It was we being late | B． | It was our being late | ||
| C． | It was we were too late | D． | It was because we were late |
11．cloth（ ）
| A． | host | B． | comment | C． | bone | D． | polite |
8．---Haven't I told you that you should be home earlier？
---Yes，but I _____ home earlier than I usually do．（ ）
---Yes，but I _____ home earlier than I usually do．（ ）
| A． | was coming | B． | have come | C． | came | D． | had come |