下列关于会计账簿的说法中，不正确的是（） A.设置和登记账簿是连接会计凭证与会计报表

These are two _____________ shoes.[ ]

A. pairs of

B. pair of

C. /

疑似职业病病人在诊断医学观察期间的费用，其承担者（单位）是（）。

A.劳动者

B.用人单位

C.用人单位和劳动者共同承担

D.省政府和用人单位

E.用人单位和工会组织

阅读理解。

    Birds that are half-asleep-with one brain hemisphere (半球) alert and the other

sleeping-control which side of the brain remains awake, according to a new study of

sleeping ducks.

    Earlier studies have documented half-brain sleep in a wide range of birds. The brain

hemispheres take turns sinking into the sleep stage characterized by slow brain waves.

The eye controlled by the sleeping hemisphere keeps shut, while the wakeful hemisphere's

eye stays open and alert. Birds also can sleep with both hemispheres resting at once.

    Decades of studies of bird groups led researchers to predict extra alertness in the

end-of-the-row sleepers which tend to be attacked more easily. Sure enough, the end birds

tended to watch carefully on the side away from their companions. Ducks in the inner spots

showed no preference for gaze direction.

    Also, birds napping at the end of the line depend on single-hemisphere sleep, rather

than total relaxation, more often than inner ducks did. Turning 16 birds through the

positions in a four-duck row, the researchers found that compared with 12 percent for

birds in internal spots, outer birds half-asleep during some 32 percent of napping time.

    "We believe this is the first evidence for an animal behaviorally controlling sleep

and wakefulness at the same time in different regions of the brain," the researchers say.

    The results provide the best evidence for a long-standing assumption that single-

hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an

eye on the lookout side could be widespread, he predicts. He's seen it in a pair of birds

napping side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror

-side eye closed as if the reflection were a companion and the other eye stayed open.

    Useful as half-sleeping might be, it's only been found in birds and such water animals

as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a

sleeping animal to surface occasionally to avoid drowning.

    Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA

says he wonders if birds' half-brain sleep "is just the tip of the iceberg." He

supposes that more examples may turn up when we take a closer look at other species.

1. According to the passage, birds often half sleep because _____. [ ]

A. they have to watch out for possible attacks

B. their brain hemispheres take turns to rest

C. the two halves of their brain are differently structured

D. they have to constantly keep an eye on their companions

2. What is implied about the example of a bird's sleeping in front of a mirror? [ ]

A. An imagined companion gives the bird a sense of security.

B. Birds prefer to sleep in pairs for the sake of their security.

C. The phenomenon of birds napping in pairs is widespread.

D. A single pet bird enjoys seeing its own reflection in the mirror.

3. While sleeping, some water animals tend to keep half awake in order to _____. [ ]

A. alert themselves to the approaching enemy

B. emerge from water now and then to breathe

C. be sensitive to the ever-changing environment

D. avoid being swept away by rapid currents

4. By saying "just the tip of the iceberg", Siegel suggests that _____. [ ]

A. half-brain sleep has something to do with icy weather

B. the mystery of half-brain sleep is close to being solved

C. most birds living in cold regions tend to be half sleepers

D. half-brain sleep may exist among other species

和解协议对( )有效力。

A．破产企业的全体债权人
B．破产企业的和解债权人
C．债务人的保证人
D．债务人的其他连带债务人

部门.DBF：部门号C(8),部门名C(12),负责人C(6),电话C(16)职工.DBF：部门号C(8),职工号C(10),姓名C(8),性别C(2),出生日期D部门.DBF：部门号C(10),基本工资N(8.2),津贴N(8.2),奖金N(8.2),扣除N(8.2)

查询每个部门年龄最长者的信息,要求得到的信息包括部门名和最长者的出生日期。正确的命令是【 】。

A．SELECT部门名,MIN(出生日期)FROM部门JOIN职工；　　ON部门.部门号=职工.部门号GROUP BY部门名

B．SELECT部门名,MAX(出生日期)FROM部门JOIN职工；　　ON部门.部门号=职工.部门号GROUP BY部门名

C．SELECT部门名,MIN(出生日期)FROM部门JOIN职工；　　WHERE部门.部门号=职工.部门号GROUP BY部门名

D．SELECT部门名,MAX(出生日期)FROM部门JOIN职工；　　WHERE部门.部门号=职工.部门号GROUP BY部门名