1英寸等于（）厘米。A.2.54 B.3 C.2.24 D.3.54

根据短文内容及各空中所给的首字母，填写一个适当的词，使短文意思完整且符合逻辑。

     People often left school and started working early in the past. But today, lifelong learning is becoming

q    1    common. Lucy is forty years old. She teaches physics at a c   2    in Boston. "Next term, I'll give

some of my lessons b   3    using the Internet. This is a way of teaching, but it's also a good c   4    to

study," says Lucy. "These days, I am taking classes to learn h   5    to teach on the Internet. If I don't

study, I will l   6    my job." At the same time, Lucy's parents are taking art history lessons on the

Internet. They are both seventy years old and live in New York. "We love this s   7    ,"says Lucy's father, "and we are doing it to entertain ( 使快乐) o   8    . You see, through the Internet, we can study with

people from all over the world. What f   9    it is to learn like this!" What do you think of Lucy's family?

Are you studying now? If you aren't, do it q  10   . Take up your books and learn all your life!

我国古代自秦汉以来中央和地方官制演变的基本趋势是

①削弱地方加强中央②削弱相权加强君权

③对边疆地区的管辖和治理日趋严密④逐渐强化对地方官吏的控制和监视[ ]

A．①②③④

B．①②③

C．②③④

D．①②④

河北省的中南部属于______平原，主要的农产品有______、______等．

流体与固体壁面之间对流传热时，在滞流内层传热主要以( )方式进行。

A．(热传导

B．(对流传热

C．(热辐射

D．(以上三种均有

新建高速公路路基施工中，对其中某一路段上路床压实质量进行检查，压实度检测结果分别为98.6、95.4、93.0、99.2、96.2、92.8、95.9、96.8、96.3、95.9、92.6、95.6、99.2、95.8，94.6、99.5（单位%）。请按保证率95%计算该路段的代表压实度，并进行分析评定。[已知t_0.95（n-1）/4=0.438，t_0.975（n-1）/4=0.533]