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【单选题】
唐朝前期, 73.02 %的水灾都发生在北方,南方多雨区仅占 26.98% 。仅关内道、河南道水灾频次前期总数的 50% 以上。安史之乱后,淮南道、水灾频次记载明显增加,史书中还多次出现江南西道基雨山洪的记录。据此可知A.
经济严重衰退
B.
土地政策调整
C.
经济重心南移
D.
政府管理失控
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【单选题】We were swimming in the lake suddenly the storm started.
A.
When
B.
while
C.
until
D.
before
【单选题】电路如图 3 - 11 所示,已知电源电动势 E 1 = 6 V 、 E 2 = 1 V , 电源内阻不计, 电阻 R 1 = 1Ω , R 2 = 2Ω , R 3 = 3Ω。则 R 3 上的电流。
A.
3A
B.
2A
C.
1A
D.
5A
【单选题】已知集合A={x|x 2 -4x+3≤0}，集合B为函数 y= x-2 的定义域，则A∩B等于（ ）
A.
{x|1≤x≤2}
B.
{x|2≤x≤3}
C.
{x|x≥2}
D.
{x|x≥3}
【单选题】We were swimming in the lakesuddenly the storm started．
A.
when
B.
while
C.
until
D.
before
【多选题】下面哪些句子用 sway 不恰当?
A.
We also wondered if a different context would sway students' opinions and focus as Twitter users within a higher education classroom.
B.
A faint, sharp wind made the branches of the tree around the lake sway slightly, like enraptured concertgoers. Ramon and the rest of the family had retreated
C.
How would I describe former President Bill Clinton's golf sway ? Entertaining and dangerous. Let's start with the good stuff.
D.
…my knees and shuffle forward, but Sean sleeps on a water bed so I sway back and forth, then kind of topple into him. He looks down on…
E.
He also said that the boss' mood can sway wildly from day to day’? depending upon the success of SpaceX and his car company…
【简答题】如图所示,已知电源电动势 E=2V ,内电阻不计,外电路电阻 R1=1 Ω, R2= Ω, R3=3 Ω, R4=6 Ω。求: A 、 B 、 C 、 D 四点的电位?
【单选题】已知集合A={x|x 2 -5x+6≤0}，B={x||2x-1|＞3}，则集合A∩B=（ ）
A.
{x|2≤x≤3}
B.
{x|2≤x＜3}
C.
{x|2＜x≤3}
D.
{x|-1＜x＜3}
【简答题】如图所示,已知电源电动势E 1 =18V,E 3 =5V,内阻r 1 =1Ω, r 2 =1Ω,外电阻R 1 =4Ω, R 2 =2Ω, R 3 =6Ω, R 4 =10Ω,电压表的读数是28V,求电源电动势E 2 和A、B、C、D各点的电位。
【简答题】计算题：如图所示，已知电源电动势E 1 ＝6V，E 2 ＝1V，电源内阻不计，电阻R 1 ＝1Ω，R 2 ＝2Ω，R 3 ＝3Ω，试用支路电流法求各支路的电流。
【单选题】We were swimming in the lake _____ suddenly the storm started.
A.
when
B.
until
C.
while
D.
before
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