A small car is big enough for a family of three ____ you need more space for baggage.

A. once                              B. because                  C. if                           D. unless

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 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 interdependencies 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, 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 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.”

72. 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 sufficient time

C. they had no ready-made components

D. they could no assemble the components

73. 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

D. has been put into wide application

74. 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.

75. 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

When I was six, Dad brought home a dog one day, who was called “Brownie”. My brothers and I all loved Brownie and did different things with her. One of us would walk her, another would feed her, then there were baths, playing catch and many other games. Brownie, in return, loved each and every one of us. One thing that most touched my heart was that she would go to whoever was sick and just be with them . We always felt better when she was around.

One day, as I was getting her food, she chewed up(咬破)one of Dad’s shoes, which had to be thrown away in the end. I knew Dad would be mad and I had to let her know what she did was wrong. When I looked at her and said, ”Bad girl,” she looked down at the ground and then went and hid. I saw a tear in her eyes.

Brownie turned out to be more than just our family pet, she went everywhere with us .People would stop and ask if they could pet her. Of course she’d let anyone pet her. She was just the most lovable dog. There were many times when we’d be out walking and a small child would come over and pull on her hair. She never barked(吠) or tried to get away. Funny thing is she would smile. This frightened people because they thought she was showing her teeth. Far from the truth, she loved everyone.

Now many years have passed since Brownie died of old age. I still miss the days when she was with us.

What would Brownie do when someone was ill in the family?

A. Look at them sadly.              B. Touch them gently.

C. Play games with them.            D. Keep them company.

We can infer from Paragraph 2 that Brownie__________.

A. would eat anything when hungry   B. loved playing hide-and-seek

C. felt sorry for her mistake          D. disliked the author’s dad

Why does the author say that Brownie was more than just a family pet?

A. She was loved by everybody she met.      B. She played games with anyone she liked.

C.  She was treated as a member of the family. D. She went everywhere with the family.

Which of the following best describes Brownie?

A. Shy         B. Polite        C. Caring       D. Brave

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项.选项中有两项多余选项.

----- Can you help me?

----- Sure, what’s the problem?

----- ____81___.

----- Well, how about San Francisco? We went there last year and had a great time.

----    82  

-----Well, there is Golden Gate Bridge of course, and Golden Gate Park. It’s a really big park. You can go for long walks or take a rest in the Japanese Tea Garden. It’s beautiful there.

-----    83    

-----  There is also a place called Fisherman’s Wharf. That’s really popular with tourists. There are lots of shops, cafes and restaurants. And from there you can go on a boat trip to Alcatraz. You know, it’s a small but very beautiful island.

-----    84  

----- No, you can’t stay on the island; there aren’t any hotels. You can only go for the day. I think I’ve still got a book about San Francisco. I can lend it to you.

-----    85    

A. What can you do there?

B. Oh, great! What a great place to stay in!

C What an idea! What is the best time to go there?

D. I can’t decide where to go for the holiday-----any ideas?

E. Thanks a lot. San Francisco, here I come!

F. Hmm, that sounds good.

G. How can I go there?

—Lost and Found Office.

—________？

—I wonder if you have a small black suitcase of mine.

A．What can I do for you 

B．Who's that

C．What's that 

D．How do you do