—Your cousin has been accepted to Harvard Uni...

—Your cousin has been accepted to Harvard University on a full scholarship.

—I admire him for his determination. His success shows that we will also have the chance to succeed even if we are ________.

A.nobody B.nobodys C.nobodies

九年级英语单选题中等难度题查看答案及解析

A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf (现货供应) and so we have to develop them all on our own,” he said.

They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencie(相互依赖) on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation (计算), sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.　

While this first robotic flyer is linked to a small, off-board (外置的) power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.

Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day-to-day basis.”

1.The difficulty the team of engineers met with while making the robotic fly was that ______.

A.they had no model in their mind B.they did not have enough time

C.they had no ready-made components D.they could not control flight tasks

2.It can be inferred from paragraphs 3 and 4 that the robotic fly ______.

A.consists of a flight device and a control system

B.can just fly in limited areas at the present time

C.can collect information from many sources now

D.has been put into wide application

3.Which of the following can be learned from the passage?

A.The robotic flyer is designed to learn about insects.

B.Animals are not allowed in biological experiments.

C.There used to be few ways to study how insects fly.

D.Wood’s design can replace animals in some experiments.

4.Which of the following might be the best title of the passage?

A.Father of Robotic Fly B.Inspiration from Engineering Science

C.Robotic Fly Imitates Real Life Insect D.Harvard Breaks Through in Insect Study

九年级英语阅读单选中等难度题查看答案及解析

﹣﹣__________．

﹣﹣ Oh， I'm sorry to hear it．

A. My brother has been accepted by a key university．

B. Would you mind looking after my pet dog when I'm away on holiday？

C. We should be more independent and try to do everything by ourselves．

D. Mike's hurt in an accident and has to stay in hospital for two weeks．

九年级英语单选题中等难度题查看答案及解析

—What is your brother going to do after he 　　 from the university?

— He once told me he wanted to get further study at Qsinghua University.

A.graduates B.graduated C.is graduating D.will graduate

九年级英语单选题简单题查看答案及解析

—Where’s your father?

— He has been abroad, he 　　　 England on business for about two months.

A、has been to　　　　 B、has been in

C、has gone to　　　 　 D、went to

九年级英语单项填空中等难度题查看答案及解析

—Where is your father?　

—He ______Shanghai on business for several days.

A. has been to　 B. has gone to　 C. has been in　 D. has left for

九年级英语单项填空中等难度题查看答案及解析

---Where’s your father, Tim?

---He _________ Hong Kong on business.

A. has gone to　　 B. has been to　　 C. went to

九年级英语单项填空中等难度题查看答案及解析

Where is your mother? She_____________ Shanghai on business for a few days..

A.has been to　　 B. has gone to　　

C. went to     　　 D. has been in

九年级英语单项填空中等难度题查看答案及解析

Fu Yuan has been left at home since he was one month old. His parents left to work in Fujian. For the past eight years, Fu has only seen his parents three times although they sent home 500 yuan every two or three months.

Fu Xiaoyu, 16, has to live alone since her grandmother died three years ago. Her parents didn′t want to give up their jobs in Guangdong. Also they couldn′t afford the cost of sending her to a school in the city where they work.

These are just two of the 29 kids interviewed last summer in a village in Sichuan Province.

In the poor village, 582 adults have left to look for work, leaving 156 children without parents. Among these kids, 88 percent of them live with their grandparents, five percent live with their uncles or aunts and seven percent have to live on their own.

To our surprise, 80 percent of the children say they love going to school, even though some children have to walk along the mountain roads for two hours to get to school However, for these children, studying is not their main thing. Doing housework and taking care of younger sisters or brothers take up most of their time. Though they have to work hard at home, over 65 percent of the kids interviewed prefer that their parents can work outside. They understand how important money is for their families.

1.Fu Xiaoyu′s parents can′t send her to a school near them because 　　　 .

A. she doesn′t like the school life in big cities　

B. she has to do housework at home

C. they don′t love their daughter at all　　

D. they don′t have enough money

2.Of the 156 children, about 　　 of them have to live on their own.

A. 7　　　 B. 20　　 C. 30　　 D. 40

3.For the children like Fu Yuan, studying isn′t the main thing because 　　　 .

A. they have to go out and make money

B. they like playing games better than studying

C. they needn′t go to a good college

D. they have lots of things to do at home

4.Which of the following is NOT true?

A. Fu Xiaoyu began to live with her grandmother three years ago.

B. 29 kids are interviewed in a village in Sichuan Province.

C. It takes some children two hours to get to school.

D. Most of the kids interviewed live with their grandparents.

九年级英语阅读理解中等难度题查看答案及解析

______Jim ______his cousin has been to America, but to our surprise, _______of them know the country well.

A. Not only； but also； all

B. Neither； nor ； both

C. Both； and； each

D. Either； or； none

九年级英语单项填空中等难度题查看答案及解析