题目内容：

Directions：Read the passage carefully. Fill in each blank with a proper sentence given in the box. Each sentence can be used only once. Note that there are two more sentences than you need.

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 integrated systems. 1. 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,” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. 2. “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 inter-dependencies 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.

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, 3. “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. 4. “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,”

A. Yet, the power, sensing and computation technologies on board could have much broader applications.

B. A few years ago, his team got the go-ahead to start piecing together the components.

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

D. There are a lot of technologies and open interesting scientific questions that are really what drives humans on a day-to-day basis.

E. Thus, it might some day perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield.

F. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly.