A.x > 1it’s over!
B.x > 1
C.x <= 1
D.x <= 1it’s over!
涨价预备费计算公式中PC=∑nt=1It[(1+f)t-1]It代表()。
A.第t年的安装工程费用
B.第t年的工程费用
C.第t年的建筑工程费用
D.第t年的设备及工器具购置费用
根据下列文章,请回答 1~5 题。
Text 1
It was fifteen past nine as Made hurried into the office building where she was going to work. Her bus had inched along through heavy morning traffic, making her a few minutes late for her very first job. She decided to start out half an hour earlier the next day.
Once inside the lobby, she had to stand at the elevators and wait several minutes before she could get on one going to the sixth floor. When she finally reached the office marked "Smith Enterprises", she knocked at the door nervously and waited. There was no reply. She tapped on the door again, but still there was no answer. From inside the next office, she could hear the sound of voices, so she opened the door and went in.
Although she was sure it was the same office she had been in two weeks before when she had the interview with Mr. Smith, it looked quite different now. In fact, it hardly looked like an office at all. The employees were just standing around chatting and smoking. In the front of the room, somebody must have just told a good joke, she thought, because there was a loud burst of laughter as she came in. For a moment she had thought they were laughing at her.
Then one of the men looked at his watch, clapped his hands and said something to the others. Quickly they all went to their desks and, in a matter of seconds, everyone was hard at work. No one paid any attention to Made. Finally she went up to the man who was sitting at the desk nearest to the door and explained that this was her first day in the office. Hardly looking up from his work, he told her to have a seat and wait for Mr. Smith, who would arrive at any moment. Then Marie realized that the day' s work in the office began just before Mr. Smith arrived. Later she found out that he lived in Connecticut and came into Manhattan on the same train every morning, arriving in the office at 9:35,so that his staff knew exactly when to start working.
第 1 题 Made felt nervous when she knocked at the door because
A.it was her first day in a new job
B.she was a little bit late for work
C.she was afraid that she had gone to the wrong place
D.there was no answer from inside the office
请阅读Passage l。完成第21—25小题。
Passage 1
It"s one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is hard-wired into a mouse s brain.
But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to"cure" mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature.
The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women——it is linked to blindness and the death of unborn babies.
However, the parasite"s effects on mice are unique. Ingram and her team measured how mice reacted to a cat"s urine(尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area.
But that"s not all. The parasite was found to be more powerful than originally thought—even after researchers cured the mice of the infection. They no longer reacted with fear to a cat"s smell,which could indicate that the infection has caused a permanent change in mice"s brains.
Why does a parasite change a mouse"s brain instead of making it sick like it does to humans?
The answer lies in evolution.
"It"s exciting scary to know how a parasite can manipulate a mouse"s brain this way," Ingram said. But she also finds it inspiring."Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away."
She said, but this study has proven that wrong."This may have huge implications for infectious disease medicine."
The passage is mainly about__________. 查看材料
A.mice" s inborn terror of cats
B.the evolution of Toxoplasma
C.a new study about the effects of a parasite on mice
D.a harmful parasite called Toxoplasma gondii
A、the most important
B、more important
C、the more important
D、important
A、the most
B、most important
C、important
D、the most important
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