下列句子中没有语病、语意明确的一项是（    ）

    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?

小明等4名同学利用“清明节”假期结伴到竹海春游．

（1）途中，小明同学不慎被蜜蜂蜇伤，蜜蜂的刺液呈酸性，为了减轻痛痒，你建议他在蜇伤处涂抹随身携带的物质是____．（牛奶：pH≈6；苹果汁：pH≈3；牙膏：pH≈9；矿泉水：pH≈7）

（2）他们到附近农家乐定制的午餐食谱是：红烧肉、大米饭、炒花生、炖鸡汤．这食物中主要缺少的营养素是____．

（3）他们发现农民伯伯的铁制农具和切菜用的菜刀都是用水清洗干净后拿布擦干再放置，这样做的目的是防止铁____，其实质是铁跟空气中的____、水蒸汽等发生化学反应的结果．

工业上电解氧化铝制取金属铝．在这个反应中氧化铝、铝、氧气的质量比是（　　）

    甲文：金溪民方仲永，世隶耕。仲永生五年，未尝识书具，忽啼求之。父异焉，借旁近与之，即书诗四句，并自为其名。其诗以养父母、收族为意，传一乡秀才观之。自是指物作诗立就，其文理皆有可观者。邑人奇之，稍稍宾客其父，或以钱币乞之。父利其然也，日扳仲永环谒于邑人，不使学。

    余闻之也久。明道中，从先人还家，于舅家见之，十二三矣。令作诗，不能称前时之闻。又七年，还自扬州，复到舅家问焉，曰“泯然众人矣。”

    乙文：（李贺）七岁能辞章，韩愈、皇甫铈^①始闻未信，过其家，使贺赋诗，援笔辄就如素构^②，自名曰《高轩过》^③。二人大惊，自是有名。每旦日出，骑弱马，从小奚奴^④，背古锦囊，遇所得^⑤，书投囊中。未始先立题然后为诗，如他人牵合程课者^⑥。及暮归，足成之。……（母）见所书多，即怒曰：“是儿要呕心乃已耳！”

【注释】①皇甫铈（shí）：唐朝著名文学家，古文运动的参与者。②援：拿。素构：早就构思好的。③《高轩过》（xuān）：题目名。过，拜访意。意思是高贵的车子来临，指韩、皇甫二人来访。④奚（xī）奴：童仆，奴仆。⑤得：心得感受。⑥牵合：指受到束缚。程课：固定的格式。此句意为不曾有过先确定题目再写诗的事，就像其他牵强附和旧章法的人。