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【单选题】
circumstanceA.
n.车辆
B.
n.屏,幕
C.
n.研究院职位,研究员薪金
D.
n. 情况,环境
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【简答题】Life in the 21 st century is different from that in the 20 th century because there are many changes in the new century.What will our life be like in 20 years?Maybe we will have robots at home. Here i...
【简答题】In the 21st century Americans
【简答题】Life in the 22 nd century will be different from that in the 21 st century because many changes will happen in the new century. 1_____ what will the changes be? First, the population is growing very f...
【简答题】请听写出下列正确化学用语符号。
【简答题】机械辅助呼吸有辅助/控制呼吸,是一种_________起动.________限定.______切换的通气方式。
【单选题】设函数 f ( x )＝ x 3 －4 x ＋ a ，0＜ a ＜2．若 f ( x )的三个零点为 x 1 ， x 2 ， x 3 ，且 x 1 ＜ x 2 ＜ x 3 ，则
A.
x 1 ＞－1
B.
x 2 ＜0
C.
x 2 ＞0
D.
x 3 ＞2
【简答题】A．In the 19th century. B．In 1973. C．In 1998. D．In the 21st century.
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