问题描述：
a.are used b.were used c.are being designe
a. are used
b. were used
c. are being designed
d. were designed
e. has been programmed
f. was invented
g. will be run by "smart" robots
h. robots may be so advanced
i. unlikely
j. Robots which walk
a. are used
b. were used
c. are being designed
d. were designed
e. has been programmed
f. was invented
g. will be run by "smart" robots
h. robots may be so advanced
i. unlikely
j. Robots which walk
问题解答：
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