关于龟板与鳖甲的描述，正确的是（） A.共同功效是滋阴潜阳，退虚热 B.可同治肾阴不

质量相等的两种相溶液体，密度分别为ρ₁和ρ₂，混合后密度为[ ]

A. ρ₁+ρ₂/2

B. 2ρ₁×ρ₂/（ρ₁+ρ₂）

C.ρ₁×ρ₁/（ρ₁+ρ₂）

D. ρ₁+ρ₂

如图所示，两平行金属导轨CD、EF间距为L，与电动势为E的电源相连，质量为m、电阻为R的金属棒ab垂直于导轨放置构成闭合回路，回路平面与水平面成θ角，回路其余电阻不计．为使ab棒静止，需在空间施加的匀强磁场磁感强度的最小值及其方向分别为（　　）

A．

mgR

El

，水平向右

B．

mgRcosθ

El

，垂直于回路平面向上

C．

mgRtanθ

El

，竖直向下

D．

mgRsinθ

El，垂直于回路平面向下

As time goes on, I am no longer young, I have friends whose mothers have passed away.  I have heard these sons and daughters say they never fully appreciated their mothers   1   it was too late to tell them. I am blessed with the dear mother who is still alive. I   2   her more each day. My mother does not change, but I   3  . As I grow older and wiser, I realize   4   an extraordinary' person she is. How   5   that I am unable to speak these words in her   6 , but they flow easily from my pen.

As a daughter, how to thank her mother for life itself?? For the love, patience and just   7   hard work that go into   8  a child? For running after a toddler (学走步的小孩), for understanding a   9   teenager, for tolerating a college student who knows  10 ? For waiting for the day when a daughter   11   how wise her mother really is?

How does a   12   woman thank a mother for   13   to be a mother? For being ready   14   advice when asked or remaining   15   when it is most appreciated? For not saying, “I told you so,” when she could have said these words  16  ? For being  17  herself-loving, thoughtful, patient, and forgiving? I don' t know how, dear God, except to ask you to bless her as richly as she   18   and to help me live up to the example she has   19 . I pray that I will look as good in the eyes of my children as my mother   20   in mine.

1．A．as             B．that           C．until               D．when

2．A．approve        B．appreciate     C．need               D．resemble

3．A．do             B．have           C．did              D．will

4．A．how            B．that          C．who               D．what

5．A．sad             B．glad           C．comic              D tragic

6．A．absence          B．presence       C．appearance         D．existence

7．A．common        B．plain          C．normal            D．usual

8．A．raising          B．rising           C．developing         D．training

9．A．childish         B．energetic      C．fearless            D．moody

10．A．anything       B．something     C．everything          D．nothing

11．A．detects        B．discovers      C．recognizes          D．realizes

12．A．pretty         B．foolish         C．green           D．grown

13．A．failing        B．intending      C．continuing         D．keeping

14．A．by          B．with           C．for                D．on

15．A．silent        B．quiet          C．cool               D．noiseless

16．A．dozen times   B．a dozen of times C．dozens of times   D．dozen of time

17．A．valuably     B．essentially     C．naturally           D．actually

18．A．devotes      B．deserts        C．deserves            D．desires

19．A．set         B．settled          C．placed             D．fixed

20．A．sees         B．finds           C．is                 D．looks

游击战十六字诀“敌进我退，敌驻我扰，敌疲我打，敌退我追”所体现出的道家智慧是（）

A.为而不争

B.上善若水

C.哀兵必胜

D.柔弱胜刚强

在船舶电站自动准同步并车的控制电路中，为获得适当的合闸超前角所采取的方案可以是（）。

A.恒定超前时间方案

B.频率比较方案

C.超前相角方案

D.A或C