He stood last but one among the twenty interv...

He stood last but one among the twenty interviewees, _________, he failed the interview.

高三英语单项填空简单题查看答案及解析

He has written several books, but his last works _____ well known among his friends.

A. have          B. have been            C. is                D. are

高三英语单项填空中等难度题查看答案及解析

—How was the journey?

—Tiring! I caught the train at the last second but all the seats _____．I stood all the way．

A．would occupy                            B．had occupied

C．had been occupied                       D．would be occupied

高三英语单项填空中等难度题查看答案及解析

He stood at the window, thinking where he 　　 his camera last.

A. saw　　　　 B. has seen 　　　　 C. had seen 　　　　 D. would see

高三英语单项填空中等难度题查看答案及解析

Among so many scientists in this field, he ______ and achieved great success.

高三英语单项填空中等难度题查看答案及解析

One day, gardeners might not just hear the buzz of bees among their flowers, but the whirr of robots, too. Scientists have managed to turn an unassuming drone (无人机) into a remote-controlled pollinator (授粉媒介) by attaching horsehairs coated with a special, sticky gel to its underbelly.

Animal pollinators are needed for the reproduction of 90% of flowering plants and one third of human food crops. Chief among those are bees — but many bee populations in the United States have been in steep decline in recent decades. Thus, the decline of bees isn't just worrisome because it could disrupt ecosystems, but also because it could disrupt agriculture and economy. People have been trying to come up with replacement techniques, but none of them are especially effective yet.

Scientists have thought about using drones, but they haven't figured out how to make free-flying robot insects that can rely on their own power source without being attached to a wire. “It’s very tough work,” said senior author Eijiro Miyako, a chemist at the National Institute of Advanced Industrial Science and Technology. His particular contribution to the field involves a gel, one he’d considered a mistake 10 years before and stuck in a storage cabinet. When it was rediscovered a decade later, it hadn’t dried up or degraded at all. “I was so surprised because it still had high viscosity,” Miyako said.

The chemist noticed that when dropped, the gel absorbed an impressive amount of dust from the floor. Miyako realized this material could be very useful for picking up pollen (花粉). He and his colleagues chose a drone and attached horsehairs to its smooth surface to mimic a bee’s fuzzy body. They coated those horsehairs in the gel, and then controlled the drones over lilies, where they would pick up the pollen from one flower and then deposit the pollen at another one, thus fertilizing it.

The scientists looked at the hairs under a scanning electron microscope and counted up the pollen grains attached to the surface and found that the drones whose horsehairs had been coated with the gel had about 10 times more pollen than those that had not been coated with the gel.

Miyako does not think such drones would replace bees altogether, but could simply help bees with their pollinating duties. There’s a lot of work to be done before that's a reality, however. Small drones will need to become more controllable and energy efficient, as well as smarter, with better GPS and artificial intelligence.

1.What does the underlined word “viscosity” in Para.3 probably mean?

A.Hardness. B.Stickiness.

C.Flexibility. D.Purity.

2.We can learn from the passage that ______.

A.bees disrupt both agriculture and economy

B.scientists have invented self-powered robot insects

C.bees in the United States are on the edge of extinction

D.Miyako found the special feature of the gel by chance

3.A drone works best in picking up pollen when ______.

A.its body is made like a bee’s

B.its GPS works more efficiently

C.some flowers are coated with the gel

D.horsehairs with the gel are attached to it

4.According to Eijiro Miyako, the drones ______.

A.are not yet ready for practical use

B.may eventually replace bees in the future

C.are much more efficient than bee pollinators

D.can provide a solution to economic depression

高三英语阅读理解困难题查看答案及解析

One day, gardeners might not just hear the buzz of bees among their flowers, but the whirr of robots, too. Scientists have managed to turn an unassuming drone into a remote-controlled pollinator by attaching horsehairs coated with a special, sticky glue to the under part of it.

Animal pollinators are needed for the reproduction of 90% of flowering plants and one third of human food crops. Chief among those are bees-but many bee populations in the United States have been in steep decline in recent decades. Thus, the decline of bees isn't just worrisome because it could spoil ecosystems. but also, because it could spoil agriculture and economy. People have been trying to come up with replacement techniques, but none of them are especially effective yet.

Scientists have thought about using drones, but they haven't figured out how to make free-flying robot insects that can rely on their own power source without being attached to a wire. “It’s very tough work." said Senior author Elijio Miyako, a chemist at the National Institute of Advanced Industrial Science and Technology. His particular contribution to the field involves a kind of glue, one he'd considered a mistake 10 years before and stuck in a storage cabinet. When it was rediscovered a decade later, it hadn't dried up or broke down at all. “I was so surprised because it still had high viscosity,” Miyako said.

The chemist noticed that when dropped, the glue absorbed an impressive amount of dust from the floor. Miyako realized this material could be very useful for picking up pollen. He and his colleagues chose a drone and attached horsehairs to its smooth surface to imitate a bee's furry body. They coated those horsehairs in the glue, and then controlled the drones over flowers, where they would pick up the pollen from one flower and then deposit the pollen at another one, thus fertilizing it.

The scientists looked at the hairs under a scanning electron microscope and counted up the pollen grains attached to the surface and found that the drones whose horsehairs had been coated with the glue had about 10 times more pollen than those that had not been coated with the glue.

Mivako does not think such drones would replace bees altogether, but could simply help bees with their pollinating duties. There’s a lot of work to be done before that's a reality, however. Small drones will need to become more controllable and energy efficient, as well as smarter, with better GPS and artificial intelligence.

1.What does the underlined word “viscosity” in Para.3 probably mean?

A.Hardness. B.Stickiness.

C.Flexibility. D.Purity.

2.We can learn from the passage that　　　　　　　 .

A.bees disturb both agriculture and economy

B.scientists invented automatic robot insects

C.Miyako found the special feature of the glue accidently

D.bees in the United States are on the edge of extinction

3.A drone works best in picking up pollen when ___

A.it is coated with the glue B.its body is made like a bee's

C.researchers control it precisely D.horsehairs with the glue are attached to it

4.According to Eijiro Miyako, the drones____

A.are not yet ready for practical use B.may eventually replace bees in the future

C.are much more efficient than bee pollinators D.can provide a solution to economic depression

高三英语阅读理解中等难度题查看答案及解析

Mr. Green stood up in defence of the 16-year-old boy, saying that he was not the one        ．

A．blamed        B．blaming     C．to blame            D．to be blamed

高三英语单项填空简单题查看答案及解析

Mr. Green stood up in defence of the 16-year-old boy, saying that he was not the one ______ .

A. blamed　 B. blaming　 C. to blame D. to be blamed

高三英语单项填空中等难度题查看答案及解析

Mr. Green stood up in defense of the 16-year-old boy, saying that he was not the one ________.

A. blamed   B. blaming  C. to blame D. to be blamed

高三英语单项填空中等难度题查看答案及解析