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【单选题】
细胞在DNA复制过程中会出现差错,细菌细胞具有校正和修复功能,除了DNA聚合酶的纠错功能外;还有比较复杂的( )。A.
光复活基质
B.
代谢调控
C.
基因突变
D.
生理调节
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【单选题】Better take a break. You ______ the Internet for more than three hours. [ ]
A.
are surfing
B.
surfed
C.
have surfed
D.
have been surfing
【判断题】“山无陵,江水为竭,冬雷震震,夏雨雪,天地合,乃敢与君绝。”中列举了五种不可能出现的自然现象,与 《菩萨蛮》在思想内容和艺术表现手法上明显地受到它的启发。 “枕前发尽千般愿 , 要休且待青山烂。水面上秤锤浮 , 直待黄河彻底枯。白日参辰现 , 北斗回南面 , 休即未能休 , 且待三更见日头。”
A.
正确
B.
错误
【简答题】Last Sunday I saw the hardest storm in years. It came suddenly and went on for more than three hours. After lunch, I went into my room to have a rest. The air was hot, and all was quiet. Then the stro...
【单选题】Yesterday the Chinese teacher made us ______ at school for more than three hours.
A.
to stay
B.
stayed
C.
stay
【单选题】It is said that this bridge has ______ for more than three centuries.
A.
appeared
B.
existed
C.
risen
D.
born
【多选题】关于随机接入描叙不正确的是：（ ）
A.
随机接入分为基于竞争与基于非竞争两种，根据网络配置，初始接入及切换过程中都可以是基于竞争接入或基于非竞争接入
B.
随机接入分为基于竞争与基于非竞争两种，根据网络配置，初始接入可以为基于竞争接入或基于非竞争接入，切换过程只能是基于非竞争接入。
C.
随机接入分为基于竞争与基于非竞争两种，根据网络配置，初始接入可以为基于竞争接入或基于非竞争接入，切换过程中无随机接入。
D.
随机接入分为基于竞争与基于非竞争两种，根据网络配置，初始接入只能是基于竞争接入，切换过程中的随机接入可以是基于竞争也可以是基于非竞
【单选题】The students in Grade Nine their homework for more than three hours every day, so they _ have any time to play. [ ]
A.
were made to do, hardly
B.
are made to do, hardly
C.
were made do, hardly
D.
are made do, hardly
【简答题】炒制程序可由哪五个步骤组成?
【单选题】My father _______ glasses for more than three years. [ ]
A.
wear
B.
wears
C.
has worn
D.
is wearing
【单选题】Ben enjoyed staying in the hospital, so he stayed there for more than three months.
A.
真
B.
False
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