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【单选题】
美国科学家莫尔斯成功发明了有线电报和莫尔斯电码,拉开了________信息技术发展的序幕。A.
古代
B.
近代
C.
现代
D.
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【单选题】In Unit 4. One night he caught some mice in his office and made friends with ________.
A.
all of them
B.
one of them in particular
C.
none of them
D.
some of them
【简答题】One night, however, our vicar woke up with a start: the clock was the hours! Looking at his watch, he saw that it was one o'clock, but the bell struck thir times before it stopped. Armed with a to...
【单选题】如微信群内看到“未经证实”关于身边某某地又发现新的新型冠状病毒肺炎情况的文章和图片信息。应该如何应对()
A.
积极转发 扩散
B.
不信谣，不传谣，等待官方信息
C.
不转发，但积极评论
D.
只转发给少部分好友
【简答题】设函数f（x）=lg（x 2 +ax-a-1），给出下列命题： （1）f（x）有最小值； （2）当a=0时，f（x）的值域为R； （3）当a＞0时，f（x）在区间[2，+∞）上有单调性； （4）若f（x）在区间[2，+∞）上单调递增，则实数a的取值范围是a≥-4． 则其中正确的命题是______．（写上所有正确命题的序号）．
【简答题】判断下列函数的奇偶性 （1）f(x)= （2）f(x)=-3x+1 2、判断下列函数的单调性 （1）f（x）=4x-2 （2） f(x)=-x 3、判断函数f(x)= 在区间（0，+∞）内的单调性。
【单选题】One night he caught some mice in his office and made friends with ________.
A.
all of them
B.
one of them in particular
C.
none of them
D.
some of them
【简答题】John lives in a small town. He has a shop in which he sells books. He‟s busy all the time and his wife does all homework. One day, Mike, his little son, caught a cold. His wife sent him to the hospita...
【简答题】One night he heard some mice in the wastebasket. He caught them and kept them in small cages on his desk. One of these little mice became his particular friend and gave him the idea for the famous car...
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