题目内容：

    Researchers have been looking forward to using tiny flying robots to settle important tasks. The various machines could be used to help astronauts on space missions, and even to help bees with plant pollination(授粉). However, fitting the heavy electric equipment that is used to power and control the wings into the tiny robot has been challenging. Now thanks to RoboBee X-Wing—the world’s lightest aerial vehicle that can fly not tied to a power source.

Made by Harvard researchers, the insect-inspired robot weighs only 259 milligrams, has four wings whose distance is 3.5 centimeters, and stands 6.5 centimeters high. Its four small wings, which can flap up(拍动) to 170 times a second, are controlled by actuators(驱动器). They become small when the electricity passes through them. Six small solar cells, fitted above the wings to prevent them from disturbing the flight, provide the power.

RoboBee X-Wing is powered by six solar cells. To test its flying abilities, the team, led by doctor Noah Jafferis and PhD student Elizabeth Helbling, exposed the RoboBee X-Wing’s solar cells to LED lighting. To their delight, the tiny robot’s wings began to flap, and it rose, keeping a flight for about half a second. Though the robot lost its flight ability as soon as the power source was turned off, its short flight was cheered for its huge effect on the future of tiny flying robots.

However, though the current RoboBee X-Wing is a step in the right direction, it is not quite ready for main time. The researchers also hope to experiment with other power sources, such as batteries, sun light or radio frequency signals, and to add more advanced “brains” and sensor systems to navigate and complete tasks independently.

1.What can we know about small flying robots according to the first paragraph?

A.They are made to do ordinary tasks by scientists.

B.They can be used only for very dangerous task.

C.They can be powered directly by the energy of the sun.

D.It’s not easy to fit the heavy electric equipment into them.

2.Why is RoboBee X-Wing considered having a big effect on the future of tiny flying robots?

A.Because it is ready for the instant use.

B.Because it can take off and fly out of control.

C.Because it can fly not tied to a power source.

D.Because it can settle important tasks.

3.Which of the following is TRUE about RoboBee X-Wing?

A.It can’t be used in crowded places.

B.It can be used for giving directions.

C.It can use radio signals to power itself.

D.It still can’t be used widely at present.

4.In which section of a newspaper may this text appear?

A.Entertainment. B.Science.

C.Education. D.Health.