1、如图所示，直线 \(y = \frac{1}{2}x\)与双曲线 \(y = \frac{k}{x}\)（k＞0，x＞0）交于点A，将直线 \(y = \frac{1}{2}x\) 向上平移4个单位长度后，与y轴交于点C，与双曲线 \(y = \frac{k}{x}\)（k＞0，x＞0）交于点B，若OA=3BC，则k的值为（ ）．
A．3
B．6
C．\(\frac{9}{4}\)
D． \(\frac{9}{2}\)
（第1题）
八年级下册 数学专题练习——反函数（精选）
1、如图所示，直线 \(y = \frac{1}{2}x\)与双曲线 \(y = \frac{k}{x}\)（k＞0，x＞0）交于点A，将直线 \(y = \frac{1}{2}x\) 向上平移4个单位长度后，与y轴交于点C，与双曲线 \(y = \frac{k}{x}\)（k＞0，x＞0）交于点B，若OA=3BC，则k的值为（ ）．
A．3
B．6
C．\(\frac{9}{4}\)
D． \(\frac{9}{2}\)
（第1题）
八年级下册 数学专题练习——二次根式（精编60题）（含答案）
一、选择题。
1、式子\(\frac{1}{{\sqrt {x – 1} }}\)在实数范围内有意义，则x的取值范围是（ ）
A．x＜1
B．x≤1
C．x＞1
D．x≥1
2、已知，则 \(\sqrt {{{\rm{x}}^2} – 8x + 16}= 4 – x\)的取值范围是（ ）
A．为任意实数
B．0≤x≤4
C．x＞4
D．x≤4
八年级下册 英语 第五单元Good manners选择50题（含答案）
( ) 1.(2015•南京)— Why didn’t Peter his homework？
—He said he had lost his workbook. I think it’s an excuse.
A. does
B. doing
C.do
D. did
( ) 2. (2014•济南) Mr Cooper is tired do anything this morning.
A. so; that
B. too; to
C. both; and
D. so; as
八年级下册 英语 第四单元A good read选择50题（含答案）
( ) 1. (2016•盐城)—Is that man Mr Green？
—It be him. He has gone to Paris on business.
A. may
B. must
C. can’t
D. shouldn’t
( ) 2. (2016•南通) They went climbing the morning of May I and came back the afternoon.
A. on; on
B. in; in
C. on; in
D. in; on
八年级下册 英语 第三单元Online tours选择50题（含答案）
( ) 1. (2016•菏泽) —Did you have good time yesterday?
—Yeah, I really had fun at the party!
A. a; ／
B. a; the
C. /; the
( ) 2. (2016•淮安) Lily often helps her mother do some cooking in the .
A. kitchen
B. garden
C. bathroom
D. bedroom
八年级下册 英语 第二单元Travelling选择50题（含答案）
( ) 1. (2016•铜仁) —Do you know the children over there?
—Yes. names are Mike and Jane.
A. Theirs
B. Their
C. Her
D. His
( ) 2. (2016•绥化) I have friends，so I feel sad.
A. few
B. a few
C. little
八年级下册 英语 第一单元Past and present选择50题（含答案）
( ) 1. (2016•重庆A) It’s sports time. Most students in Class 1 are playing football on the playground.
A. boy
B. boys
C. boy’s
( ) 2. (2014•天津) — you ever the new Minyuan Stadium？
—No, I haven’t.
A. Do; visit
B. Have; visited
C. Did; visit
D. Are; visiting
八年级下册 英语 画线部分提问50题（含答案）
1. They have known each other for a long time.
they each other?
2. I know Zhouzhuang very well because I have lived there for ten years.
you know Zhouzhuang very well?