the traffic rule says young children under the age of four and ___-less than 40 pounds must be in a

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• 2010江苏高考英语一道非谓语单选.the traffic rule says young children under the age of four and___less than 40pounds must be in a safety seat.答案是weighting 可是我选择weighted 因为我觉得小孩的体重是被称量啊.那又用ING是什么意思.为什么不能用ed形式呢.不好意思没积分了.不好意思,是weighing.什么叫被动是把宾语变成主语呀,weigh什么时候做及物动词啊.如果此处是不及物动词的话,那后面为什么加less than 40pounds呃.
• 有3道英语选择题.1.If you plant watermelon seeds in the spring ,you( )fresh watermelon in the fall.A.eat B.would eat C.have eaten D.will be eating为什么不能选B啊?是不是后面不能用would那种的?2.For many years,people( )electric cars .However,making them has been more difficult than predicted.A.had dreamed of B.have dreamed ofC.dreamed of D.dream of这题为什么不选C啊?为什么一定要在前面加一个have?3.The traffic rule says young children under the age of four and ( )less than 40pounds must be in a child s
• the traffic rule says young children under the age of four and ___-less than 40 pounds must be in a
• 20.The traffic rule says young children under the age of four and ____
• the traffic rules says young children who_less than 40pounds must be in a child safety seat.
• 已知数列{an}的前n项和为Sn，且an是Sn与2的等差中项，数列{bn}满足b1=2，点P(bn，bn+1)(n∈N*)在直线y=x+2上，（1）求数列{an}，{bn}的通项公式；（2）设cn=an•bn(n∈N*)，求数列{cn}的前
• 20.The traffic rule says young children under the age of four and ____