我国幅员辽阔，经、纬跨度都比较大，这造成了( )。A．南甜北咸，东酸西辣 B．一山

Some young Cambodians are learning a new sport — skateboarding. Fifteen-year-old Chea Sophanit    1   (skate) for about six months. “When I see the different skaters, I just want to be like    2    .” he says. Sports like boxing and soccer are wildly popular in Cambodia,    3    Chea says skating has already become his favourite sport.

   4    nongovernmental organization called Skateistan Cambodia organizes    5   (week) programs at the park. Skateistan Cambodia started its work in Afghanistan. Rory Burke works with the group,   6    expanded to Cambodia later. He says learning to deal    7    difficulties is part of the lesson for these young skateboarders.

Seventeen-year-old Sang Rotha began skateboarding more than a year ago. “Sometimes I don’t do well    8    subjects like math,” he says. “I feel bad when I find    9    hard to keep up with my lessons.” Before he started training, it seemed very easy. But it was very difficult to learn tricks, and he got hurt a lot from falling off.   10   (learn) skateboarding has taught him to face difficulties and challenges.

患者，男，56岁。精神不振，体倦乏力，面色萎黄，畏寒肢冷，腰膝酸软，阳痿，舌淡脉沉细。

下列选项，不能治疗阳痿的药物是（）。

A.菟丝子

B.龙眼肉

C.沙苑子

D.韭菜子

E.肉苁蓉

某校学生利用暑假从我国大兴安岭出发, 向西经内蒙古、甘肃到新疆等地进行社会实践活动。读图，回答下列问题

（1）下列有关考察团员的叙述，可信的是[ ]

A．河套平原上的农民在引黄灌溉

B．塔里木河的河床全部干涸

C．金昌市在开采以铜为主的多金属矿产

D．沿途的植被变化依次为荒漠－荒漠草原－草原

（2）他们途经“三北防护林”时，认为“三北”防护林的主要环境作用有（选两点） [ ]

A．扩大木材蓄积量，增加人民收入

B．美化环境，减弱噪声

C．防风固沙，保护农田

D．净化空气，消烟滞尘

（3）考察活动结束后，同学们认为西北地区今后发展经济中需解决的问题是（选两点） [ ]

A．过度放牧，滥垦草原

B．基础建设落后，环境恶化

C．能源短缺，人口稠密

D．缺乏优良的农业和畜牧业品种

（4）你认为应如何治理本区的生态环境（至少两点）？___________________________________________________________________________________________________________________。

Win2000的磁盘配额设置中，可以使用的设置值有（）。

A.每个用户可以使用的磁盘配额

B.配额的临界值

C.是限制所有用户还是单个用户

D.配额的自动关闭

属于其他香豆素类的成分是

A．补骨脂内酯
B．茵陈素
C．黄檀内酯
D．花椒内酯
E．茵陈炔内酯