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【简答题】
概括的说CSMA/CD协议,可以用四句话简单表述:先听后发,( ),冲突后停止,随机延迟一段时间后重发。
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【简答题】A．He can't afford to play for four hours a day. B．He finds it easy to improve his English. C．He won't accept the woman's advice. D．He will spare no efforts to improve his English.
【多选题】在画树枝时 以下说法恰当的有
A.
自然界中树枝千姿百态，因此画树枝时，可以画平行的树枝
B.
需要画出树枝的生长点
C.
画分枝的线不能太直
D.
要画出向上生长的趋势
【简答题】依据文件被删除的原理,在FAT文件系统下能用于恢复文件的信息只有目录项中被删除文件( )的和文件( ),而整个簇链的信息在文件删除时已经被清空了,
【简答题】--When _______he ________(draw) a picture every day? --He _________(draw) a picture at four o’clock in the afternoon.
【简答题】When my son, Justin, was four, he found a caterpillar（毛毛虫）and put it in a box. Each day he it fresh grass and leaves . In a few weeks, the caterpillar became fat and was ready to sleep. One morning we...
【简答题】根据短文内容填空。 Mike is a small boy, and he hates soap and water. Three or four times every day his mother says to him. 'Mike. your hands are very dirty again. Go and wash them.' But Mike never really washe...
【单选题】One day a farmer bought four donkeys at the market place in the village. He got 【B1】 the back of one of 【B2】 and began to ride home. 【B3】 he was riding along, he noticed that 【B4】 were only three donk...
A.
to
B.
at
C.
on
D.
for
【单选题】My father sleeps four hours a day, eats too much meat but never eats fruit. He must be _________. [ ]
A.
serious
B.
unhealthy
C.
athletic
D.
intellectual.
【单选题】David lives on the ________ floor. It is too high, so he has to take a lift every day.
A.
fourty
B.
fourtieth
C.
forty
D.
fortieth
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