CVC辊型与弯辊的最佳配合是什么？

阅读理解。

     Our "Mommy and Me" time began two years ago. My next-door neighbor

and fellow mother, Christie, and I were out in our front yards, watching seven

children of age 6 and under ride their bikes up and down. "I wish I could take

one of my children out alone," said Christie.

     Then we worked out a plan: When Christie takes one of her children out,

I'll watch her other three. And when she watches two of mine, I'll take

someone out.

     The children were extremely quick to accept the idea of "Mommy and Me"

time. Christie's daughter, McKenzie, went first. When she returned, the other

children showered her with tons of questions. McKenzie was smiling broadly.

Christie looked refreshed and happy. "She's like a different child when there's

no one else around," Christie shared with me quickly. With her mother all to

herself, McKenzie didn't have to make an effort to gain attention.

     Just as Christie had noticed changes in McKenzie, I also discovered

something different in each of my children during our alone times. For example,

I am always surprised when my daughter, who is seldom close to me, holds

my hand frequently. My stuttering(口吃的)son, Tom, doesn't stutter once

during our activities since he doesn't have to struggle for a chance to speak.

And the other son, Sam, who's always a follower when around other children,

shines as a leader during our times together.

     The "Mommy and Me" time allows us to be simply alone and away with

each child ---talking, sharing, and laughing, which has been the biggest gain.

Every child deserves(应得到)to be an only child at least once in a while.

1. What is the text mainly about?

A. The experience of the only child being with mother.

B. The advantage of spending time with one child at a time.

C. The happy life of two families.

D. The basic needs of children.

2. Right after McKenzie came back, the other children were _____________.

A. happy

B. curious

C. regretful

D. friendly

3. What is one of the changes the author finds in her children?

A. The daughter acts like a leader.

B. Sam holds her hand more often.

C. The boys become better followers.

D. Tom has less difficulty in speaking.

4. The author seems to believe that ___________.

A. having brothers and sisters is fun

B. it's tiring to look after three children

C. every child needs parents' full attention

D. parents should watch others' children

若一次函数y=（3-k）x-k的图象经过第二、三、四象限，则k的取值范围是（　　）

A．k＞3

B．0＜k≤3

C．0≤k＜3

D．0＜k＜3

哪些药物不影响REM的睡眠时相（）

A.苯巴比妥

B.地西泮

C.水合氯醛

D.硫喷妥

E.三唑仑

影响生物利用度较大的因素是（）

A.给药次数

B.给药时间

C.给药剂量

D.给药途径

E.年龄

以“三个代表”为核心的选择标准是（）。

A.代表先进技术发展方向

B.代表广大市场的需求

C.代表股东根本利益

D.代表大股东利益