题目内容
（请给出正确答案）
[主观题]
The edges of a cube are each 3 inches long. What is the surface area, in square inches, of
this cube？
A.9
B.18
C.27
D.36
E.54
提问人：网友kingylh
发布时间：2022-01-06
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Questions are based on the following passage．
Cubes aren"t usually the go-to shape when creating an object that"s meant to move around， but （1）in Switzerland have created one that can do just that—along with a（2）of other surprising talents. Called the Cubli， it measures nearly 6 inches oneach side and can walk around by （3） flipping itself over. Perhaps more impressively， itcan also balance on any of its sides or even just a single corner. As the research team fromETH Zurich"s Institute for Dynamic Systems and Control（4）in a video， the cube caneven remain balanced while a surface is raised up at an angle beneath it.
Though it"s a moving cube， the Cubli still （5） on a series of spinning wheels to getgoing. Three internal wheels angled along a different axis each will spin faster or slower inorder to maintain enough momentum to keep the cube balanced. By quickly（6）a spinningwheel， the cube can also be caused to flip over，（7）allowing it to move around. Theresearchers say that Cubli"s system of spinning wheels is similar to what （8） satellitesout in space， and that other research groups have considered using this technology to buildrobots that could be used to explore other planets.
A group of researchers at MIT later demonstrated another use for（9）like this:allowing a robot to reassemble itself. MIT"s cubes had magnets embedded across theirsides and edges， which let them grip each other and form. different shapes. Though theyweren"t able to balance like the Cubli can， MIT"s "M-blocks" could move much（10）actually hopping offthe ground when getting around.
A．blocks
B．continually
C．delightful
D．demonstrates
E．effectively
F．further
G．halting
H．handful
I．hardly
J．preceding
K．relies
L．researchers
M．spheres
N．stabilizes
O．stronger
第1题应选（） 查看材料
，其正确定义的过程为_____。
