试述外汇储备的经营原则。

汽车库内双向车道的宽度不宜小于()米。

A．4

B．5

C．6

D．7

在均匀介质中，光是沿           传播的．激光准直利用了                              的原理．

In order to separate loving parents from their freshman sons, Morehouse College in Atlanta has held a/an __36___"Parting Ceremony."

When University of Minnesota freshmen __37___ at the end of this month, parental separation will be a little trickier: mothers and fathers will be ___38__ to a reception elsewhere ___39__ students can meet their roommates and talk about dorm room space -- __40__ adult breaking in.

In the latest wave in which superinvolved parents __41___ their children to college, universities are __42__  activities ___43__ to speed the separation. In the age of MSN and twice-daily texts home, ___44__ colleges are urging "sticky parents" to leave sooner so students can __45__ independence.

Grinnell College here, like others, has found it __46__ to make it clear when parents __47__ say goodbye. After computer printers and bags had been carried to dorm rooms, everyone gathered in the gymnasium, students on one side, __48__  on the other.

Shortly __49__, mothers and fathers were urged to leave campus.

Moving their students in usually takes a few hours. Moving on? Most deans can tell __50__ of parents who hang around campus for days. At Colgate University in Hamilton, N.Y. "We recognize it's a __51__ day for families," Beverly Low, the dean (院长) of first-year students said. Still, during various parent meetings on Colgate's move-in day, Ms. Low and other officials __52__ tell the parents __53__ that "activities for the class of freshmen begin at 4 on time, so parents should leave before 4." she said.

Formal departure ceremonies are unusual __54__ growing in popularity, said Joyce Holl, head of the National Orientation Directors Association. A more common method is for colleges to limit the hour for last hugs.__55___, the parents of Princeton freshmen learn from the move-in schedule, "the rest events are intended for students only."

小题1:A  formal                 B  informal                 C  casual              D  grand  

小题2:A  move out              B  move in                  C  move around    D  graduate

小题3:A  sent                     B  driven                    C  invited             D  called on

小题4:A  so                        B  but                         C  still                 D  yet

小题5:A  with                     B  as                           C  where              D  without 

小题6:A  rescue                  B  deliver                    C  travel                 D  release

小题7:A  running out          B  taking out        C  carrying out     D  picking out

小题8:A  wanted                 B  meant                     C  devoted       D  prepared

小题9:A  in which           B  which                     C  how                D  where  

小题10:A  form                    B  create                     C  increase           D  develop

小题11:A  necessary              B  unimportant            C  useless             D  difficult  

小题12:A  will                            B  need                   C  must            D  would  

小题13:A  teachers            B  police                     C  professors     D  parents

小题14:A  before                  B  after                       C  later                D  passed

小题15:A  news                    B  comments           C  stories             D  shadows

小题16:A  little                    B  huge                   C  long                D  large  

小题17:A  plan to                 B  take to                    C  ask to          D  carry to

小题18:A  rudely                  B  directly                   C  conveniently   D  hardly   

小题19:A  and                  B  but                         C  however      D  so

小题20:A  For the time being B  For a long time       C  For example     D  For a change

固体废物的物理特性一般指（）

A.物理组成

B.粒径

C.含水率

D.容积密度

前牙PFM冠牙本质瓷堆塑完成后，邻面回切的厚度至少是

A．1.5mm
B．1.2mm
C．1.0mm
D．0.8mm
E．0.5mm