请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
Today the energy problem becomes critical. It ______ an immediate solution.
A．calls on
B．calls for
C．calls up
D．calls at
答案
更多“Today the energy problem becomes critical. It ______ an immediate solution.A．calls onB．cal”相关的问题
第1题
将英语短文译为中文
3 Self-Powered Nanotech (10分)
Nanosize machines need still tinier power plants
By Zhong Lin Wang
The watchmaker in the 1920s who devised the self-winding wristwatch was on to a great idea: mechanically harvesting energy from the wearer’s moving arm and putting it to work rewinding the watch spring.
Today we are beginning to create extremely small energy harvesters that can supply electrical power to the tiny world of nanoscale devices, where things are measured in billionths of a meter. We call these power plants nanogenerators. The ability to make power on a minuscule scale allows us to think of implantable biosensors that can continuously monitor a patient’s blood glucose level, or autonomous strain sensors for structures such as bridges, or environmental sensors for detecting toxins — all running without the need for replacement batteries. Energy sources are desperately needed for nanorobotics, microelectromechanical systems (MEMS), homeland security and even portable personal electronics. It is hard to imagine all the uses such infinitesimal generators may eventually find.
In Brief
★Nanotechnology has huge potential — but those minuscule devices will need a power source that is better than a battery.
★ Waste energy, in the form. of vibrations or even the human pulse, could provide sufficient power to run such tiny gadgets.
★ Arrays of piezoelectric nanowires could capture and transmit that waste energy to nanodevices.
★ Medical devices will likely be a major application. A pacemaker’s battery could be charged so it would not need replacing, or implanted wireless nanosensors could monitor blood glucose for diabetics.
第2题
______ rapidly by the body, sugar provides a quick energy source.
A．Digested
B．Digesting
C．To digest
D．Having digested
第3题
A.with
B.through
C.by
D.in
第4题
As is implied in the passage, energy assessment is______.
A．free of charge
B．worthwhile in the long run
C．absolutely necessary
D．kind of troublesome
第5题
Most Californians think ______.
A．that there is no real energy crisis
B．that the energy crisis is real
C．that the utilities are working to fix the problem
D．that his business doesn't need power
第6题
A、energy
B、false
C、seed
D、prisoner
第7题
Atomic energy is going to have a______effect on the development of industry.
A．feasible
B．profound
C．painful
D．compound
第8题
A、calls off
B、calls up
C、calls for
D、calls at
第9题
Energy is obtained from rivers by ______.
A．building bridges across them
B．driving generators into them
C．building dams across them
D．directing them into homes and factories
第10题
According to the passage, double-paned windows______.
A．are energy efficient
B．can only be used as replacement
C．are only used in new buildings
D．will lower your heating costs by 50%
