结合生产实际谈谈如何做好母猪的发情鉴定及适时配种工作？

阅读短文，选择正确答案。

    Scientists (科学家) think that many animals cannot see colours. The world is black and white to them.

Scientists want to find out if (是否) dogs can see colours. When the scientists give the dogs food, they show

them a certain colour every time. The dogs get ready to eat when they see this colour. The scientists then show

the dogs another colour. Again the dogs get ready to eat. The colours are all the same to them.

    Colours are not all the same to monkeys. For example, if we put food in a red box, and do this every day, a

monkey will always go to the red box to get food. If we put food in a blue box, the monkey won't go to it.

1. Scientists show the dogs colours ________. [ ]

A. to tell them to eat

B. to find out if they can see black and white things

C. for fun

D. to find out if they can see colours

2. The dogs get ready to eat when they ________. [ ]

A. hear different pieces of music

B. see the monkeys

C. see black things

D. see all the colours

3. Colours are _______. [ ]

A. all the same to monkeys

B. not all the same to dogs

C. different to dogs

D. not all the same to monkeys

4. If we put food in a blue box and do this every day, a monkey will always go to _______. [ ]

A. the red box to get food

B. the blue box and put food in it

C. the blue box to get food

D. the red box and put food in it

5. Which of the following is TRUE? [ ]

A. Scientists find that dogs don't like colour.

B. Dogs like to hear different pieces of music.

C. Monkeys like the food in the box.

D. Monkeys will not go to the blue box if we don't show them before.

进程P1、P2、P3、P4和P5的前趋图如下：

若用PV操作控制进程P1～P5并发执行的过程，则需要设置5个信号量S1、S2、S3、S4和S5，进程间同步所使用的信号量标注在上图中的边上，且信号量S1～S5的初值都等于零，初始状态下进程P1开始执行。下图中a、b和c处应分别填写 (2) ；d和e处应分别填写 (3) ，f和g处应分别填写 (4) 。

（4）处应填（）。

A．P(S3)和V(S4)V(S5)

B．P(S3)和P(S4) P(S5)

C．V(S3)和V(S4)V(S5)

D．V(S3)和P(S4) P(S5)

The day we were looking forward to coming at last  76．      

—a weeks’ military (军事的)training began . During the  77．      

training , each of us did his or her best . We drilled (训练) more  78．      

six hours a day , because it was very hot at the time . 79．      

Our officer was a young man , was about   80．      

twenty years old . He is very strict with us during  81．      

the training and very kind to us . On talking   82．      

with him , we came to know only much information 83．      

about army life , but also about military affairs .  84．      

The military training gave us good experience . It brought  85．      

us great happiness , too . We’ll never forget it .

我国《宪法》第33条规定：“任何公民享有宪法和法律规定的权利，同时必须履行宪法和法律规定的义务。”这项规定体现出我国公民的权利和义务具有（）。

A.一致性

B.矛盾性

C.对立性

D.排斥性

不同类型、航运环境下，船舶的保安敏感信息不尽相同，通常包括以下（）内容。

①船舶保安计划；

②船舶保安设备；

③普通船舶物料信息；

④船舶保安薄弱点。

A.①～④

B.①②④

C.①③④