（○代表神经元细胞体，＜代表神经末梢，且ab=bc、ac=de）

    Workers aren't allowed to go into a big underground computer center until they step up to a machine that takes a quick picture of the tiny blood vessels (血管) inside their eyes.

    If the machine can't 1 the picture with images in its computer, the worker is stopped by security guards (保安员).

    Each person has his own way of blood vessels in his or her2.And unlike a key, the way can't be3.Old-fashioned keys and locks may soon be things of the past.High-tech security devices (安全装置) are being fixed at military (军事的) bases, computer centers and banks.Companies that 4 the machines say they'll someday be used in people's homes and cars.

    Already, a Japanese company has fixed ways that recognize (识别) people's fingerprints in 360 new homes.The machines open the doors only for the 5of the houses.The new security ways are selling well because thieves and robbers are getting better at breaking into buildings and computers that are 6 by keys and locks.Since nobody can steal or copy a fingerprint, or one's eyes, the new machines are 7.

    Other new machines recognize one's voice.Two American companies use 8 machines to keep an eye on their computers.Inexpensive voice-recognition machines may someday take the place of locks on cars.The doors would open only for the owners.The machines would 9 the owners as little as $270.Although the up-to-date machines are amazing, scientists must still solve a serious problem.How will a boy borrow his dad's car without borrowing his dad's 10?

画出图中动力臂及阻力臂.

阅读下面两首唐诗，完成小题。

慈姥竹

李白

野竹攒石生，含烟映江岛。翠色落波深，虚声带寒早。

龙吟曾未听，凤曲吹应好。不学蒲柳凋，贞心尝自保。

酬人雨后玩竹

薛涛

南天春雨时，那鉴雪霜姿。众类亦云茂，虚心能自持。

多留晋贤醉，早伴舜妃悲。晚岁君能赏，苍苍劲节奇。