千金易得，一“闲”难求。今年国庆黄金周期间，小明和父母亲一起到外地旅游，他发现景区到处人山人海，于是，他决定去最清闲的货币历史展览馆转转。据此回答1—4题。
1．小明参观展览馆时得知，货币一经产生就有两种基本职能，它们是[ ]
A．储藏手段和支付手段
B．储藏手段和世界货币
C．流通手段和价值尺度
D．流通手段和支付手段
2．小明了解到货币使用过程中经常是：“一手交钱，一手交货。”这里的钱是
①执行流通手段的职能 ②实实在在的货币 ③观念中的货币 ④执行价值尺度
A．①④
B．①②
C．③④
D．②④
3．金银货币和纸币的共同点是 [ ]
A．都是价值和使用价值的统一体
B．都是商品交换的媒介
C．都是衡量商品价值量大小的尺度
D．其本质都是一般等价物
4．在我国，人民币可以在市场上购买各种商品。这主要是因为[ ]
A．人民币为人们所乐意接受
B．人民币是商品，本身有价值
C．人民币由国发行的并强制使用的购物凭证
D．人民币是我国政府发行并强制使用的价值符号
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WASHINGTON—Laura Straub is a very worried woman. Her job is to find families for foreign teenagers who expect to live with American families in the summer.
It is not easy, even desperate.
“We have many children left to place—40 out of 75,” said Straub, who works for a foreign exchange programme called LEC.
When foreign exchange programmes started 50 years ago, more families were accommodating. For one thing, more mothers stayed at home. But now, increasing numbers of women work outside the home. Exchange-student programmes have struggled in recent years to sign up host families for the 30, 000 teenagers who come from abroad every year to spend an academic year in the United States, as well as the thousands more who take part in summer programmes.
School systems in many parts of the U.S., unhappy about accepting non-taxpaying students, have also strictly limited the number of exchange students they accept. At the same time, the idea of hosting foreign students is becoming less exotic(有异国情调的).
In search for host families, who usually receive no pay, exchange programmes are increasingly broadening their requests to include everyone from young couples to the retired.
“We are open to many different types of families,” said Vickie Weiner, eastern regional director for ASSE, a 25-year-old programme that sends about 30,000 teenagers on academic-year exchange programmes worldwide.
For elderly people, exchange students “keep us young—they really do”, said Jen Foster, who is hosting 16-year-old Nina Post from Denmark.
小题1:According to the text, why was it easier for Laura Straub to find American families for foreign students?
A．American school systems were better than now.
B．The government was happy because it could gain tax.
C．Foreign students paid hosting families a lot of money.
D．More mothers didn’t work outside and could look after children.小题2:To deal with the problem in recent years, exchange programmes have to ______.
A．extend the range of host families
B．limit the number of the exchange students
C．borrow much money to pay for the costs
D．make hosting foreign students more exotic小题3:Which of the following is the best title of this passage?
A Exchange Students Keep Old People Young.
B. Idea of Hosting Students is Different.
C. Foreign-exchange Program Is Going on.
D U.S. Struggle to Find host Families.
男性，27岁。心悸、气短，胸闷、胸痛，晕厥。查体：胸骨左缘第3肋间3/6级SM。超声：IVS：LVPWl.5：1，SAM征（+）。
肥厚型心肌病的治疗可考虑（）
A.安置DDD起搏器
B.冠脉内旋磨支架术
C.狭窄处球囊成形术
D.射频消融术
E.心肌打孔血运重建术
个别游客要求单独用餐，导游人员应提前讲清餐费自理，原餐费不退。
牙冠部胶原纤维与牙本质小管平行排列的是（）
A.前期牙本质
B.管周牙本质
C.球间牙本质
D.罩牙本质
E.髓周牙本质
一名或一对双打队员可在一场比赛中要求1次暂停，时间不超过（）分钟。