《素问》云：诸颈项强，皆属于（） A.风 B.火 C.热 D.寒 E.湿

根据发育方式，请找出与其他三个不同类的 [ ]

A．蝇

B．蝗虫

C．蟑螂

D．蝼蛄

财政部发布公告，决定发行凭证式国债。发行总 额为400亿元，其中1年期200亿元，票面年利率2.6%；3年期200亿元，票面年利率4.73%。发行国债是

①宽松货币政策的主要措施   ②国家财政支出的重要方面

③国家财政收入的重要来源   ④政府筹集资金的重要方式

A．①②

B．①③

C．③④

D．①④

D

A team of scientists proved that seals had a very good sense of hearing. These men trained blind seals to expect food when they heard sounds. The seals always began snapping(猛咬) when a strong signal was sounded.

It was proved that even a soft signal, a considerable distance away, could make these sea animals respond. That should make the fisherman who makes much noise while working, or talks loudly, start thinking.

The same team of scientists also trained seals to recognize different sounds. One bell-tone meant food ,two bell-tones meant no food. In the beginning, the seals made mistakes when the two bell-tones were sounded. They were given a light tap after each mistake. The seals were good learners. They easily learned to tell the difference between the sounds.

67.Why was it necessary to use blind seals? Because they______.

A. were unable to use sight for clues    B. had better hearing

C. were waiting to be fed             D. were the only animals to be found

68. To those seals strong signal meant_____.

A. snapping     B. nothing      C. food       D. a light tap

69. The article doesn’t say directly but suggests that fishermen usually think______.

A. seals have no good sense of hearing   B. seals have good sense of hearing

C. seals can only recognize bell sounds   D. seals can not hear soft or long distant sounds

70. Which title will be the best to suit the article?

A. Clever Seals                      B. Smart Learners 

C. An Underwater School             D. An Unknown School

下列叙述中正确的是

A) C语言中既有逻辑类型也有集合类型
B) C语言中没有逻辑类型但有集合类型
C) C语言中有逻辑类型但没有集合类型
D) C语言中既没有逻辑类型也没有集合类型

焦油加工的主要任务是获得酚、萘、蒽等纯产品和（）等粗产品。