与百分深度量无关的因素是()A、组织深度 B、射线能量 C、射野面积 D、源皮距离

关于软件著作权产生的时间，下面表述正确的是（）。

A．自作品首次公开发表时

B．自作者有创作意图时

C．自作品得到国家著作权行政管理部门认可时

D．自作品完成创作之日

Passenger pigeons（旅鸽）once flew over much of the United States in unbelievable numbers. Written accounts from the 18th and 19th centuries described flocks（群）so large that they darkened the sky for hours.

It was calculated that when its population reach its highest point, there were more than 3 billion passenger pigeons – a number equal to 24 to 40 percent of the total bird population in the United States, making it perhaps the most abundant birds in the world. Even as late as 1870 when their numbers had already become smaller, a flock believed to be 1 mile wide and 320 miles (about 515 kilometers) long was seen near Cincinnati.

Sadly, the abundance of passenger pigeons may have been their undoing. Where the birds were abundant, people believed there was an ever-lasting supply and killed them by the thousands. Commercial hunters attracted them to small clearings with grain, waited until pigeons had settled to feed, then threw large nets over them, taking hundreds at a time. The birds were shipped to large cities and sold in restaurants.

By the closing decades of the 19^th century, the hardwood forests where passenger pigeons nested had been damaged by Americans’ need for wood, which scattered（驱散）the flocks and forced the birds to go farther north, where cold temperatures and spring storms contributed to their decline. Soon the great flocks were gone, never to be seen again.

In 1897, the state of Michigan passed a law prohibiting the killing of passenger pigeons, but by then, no sizable flocks had been seen in the state for 10 years. The last confirmed wild pigeon in the United States was shot by a boy in Pike County, Ohio, in 1900. For a time, a few birds survived under human care. The last of them, known affectionately as Martha, died at the Cincinnati Zoological Garden in September 1, 1914.

小题1:In the 18^th and early 19^th centuries, passenger pigeons _______.

A．were the biggest bird in the world

B．lived mainly in the south of America

C．did great harm to the natural environment

D．Were the largest population in the US小题2:The underlined word “undoing” probably refers to the pigeons’ _______.

A．escape

B．ruin

C．liberation

D．evolution小题3:What was the main reason for people to kill passenger pigeons?

A．To seek pleasure.

B．To save other birds.

C．To make money.

D．To protect crops.小题4:What can we infer about the law passed in Michigan?

A．It was ignored by the public.

B．It was declared too late.

C．It was unfair.

D．It was strict.

1岁男性，发热、频繁呕吐、惊厥3天，疑诊为Reye综合征，为明确诊断，首先需要作下列哪项检查（）

A.血常规

B.脑脊液常规、生化检查

C.头颅CT

D.测血清总胆红素及1分钟胆红素

E.测血氨及转氨酶

黎某是我国国家工作人员，2000年，他在法国因酒后开车造成严重财产损失，据此，法国已对他进行了刑事处罚。若根据我国刑法，他可能因交通肇事罪被判2年有期徒刑。试问，我国司法机关还应追究他的刑事责任吗

A．不应追究，此案应由法国管辖

B．应该追究，因为他是我国国家工作人员

C．不应追究，因为法国已对他进行了刑事处罚

D．不应追究，因为按我国刑法，他所犯罪的法定最高刑在3年以下

斑节对虾为黄头病的主要受感染者；该病严重影响养殖（）的对虾

A.10～30d

B.30～50d

C.50～70d

D.70～90d