已知x<0,则函数y=x2+x+1x的最大值是______.

题型:填空题

问题:

已知x<0,则函数y=
x2+x+1
x
的最大值是______.
考点:基本不等式及其应用
题型:填空题

下列是电解水反应示意图和装置。示意图①~③中,“”表示氢原子,“”表示氧原子。

(1)图中表示化合物的是      (填序号),此反应类型为      

(2)②所代表的物质是右图中试管(填字母)       中产生的气体,图中A是电源的       (填“正”或“负”) 极。

题型:填空题

下列解剖学方位术语正确的是()。

A.前臂桡侧代表内侧

B.前臂尺侧代表外侧

C.小腿腓侧代表内侧

D.小腿胫侧代表外侧

E.距身体腹侧面近者为前侧

题型:填空题

正常细胞膜内K+约为细胞膜外K+浓度的()。

A.15倍

B.30倍

C.50倍

D.70倍

E.90倍

题型:填空题

正常体细胞分裂产生的新细胞,其遗传物质和原细胞相比                 

A.相同

B.增多

C.减少

D.不确定

题型:填空题

“Hey, Jenna, do you think we’ ll still be friends when we’re eighty-two?” I asked my friend.

Losing Jenna would be like losing a very close sister.

“Of course, we’ll still be friends when we’re eighty-two,” Jenna announced loudly

The next year, in Grade Four, we met Jamie. The three of us soon became close friends. We played together almost every day. I thought even time couldn’t pull us apart, but I was sadly mistaken.

The three of us started fighting a lot. Before Christmas, We had a really big fight, and Jamie and Jenna were against me, both saying I was bossy (专横的). I felt helpless and lonely. I thought Christmas would be horrible!

I was surprised when Jenna came to my house and gave me a terrible Christmas card she had made for me. I was so sure that she was still disappointed with me.

“Wow,” I said, breaking the silence as we stood on either side of my front door. “Thanks.”

“Okay…well… I have to go,” she said softly.

“Okay. See you later then…” and I closed the door.

“Who was that at the door?” my mom asked.

“It was Jenna, my classmate.” I said.

The card started off with “Merry Christmas”, but then it said, “I am so glad we’re friends. I am sorry about what I said when we were fighting. A fight won’t stop us from being friends. Besides, we said we were going to be friends even when we’re eighty-two.”

I stopped reading and started laughing. I couldn’t believe I had forgotten what she said that day in the backyard. I couldn’t believe I had been so selfish in trying to make my friends feel sorry for me.

小题1:The best title for this passage would be______________.

A.Jenna and I

B.Friends Forever

C.Friendship is very important.

D.Friendship is very necessary.小题2:How would the author and Jenna get along with each other after Christmas?

A.They would be close friends again.

B.They would not speak to each other.

C.They would lose touch with each other.

D.They would go on fighting with each other.小题3: What can we learn from the underlined sentences?

A.The author was sure Jenna felt sorry for her.

B.The author didn’t think Jenna was still angry with her.

C.The author hadn’t thought Jenna would send her a Christmas card.

D.The author knew Jenna would come to see her and said sorry to her.小题4:Which of the following is the right time order according to the passage?

a. Jamie became the author’s friend.

b. The author felt lonely and unhappy.

c. Jenna, Jamie and the author fought.

d. Jenna brought the author a Christmas card.

e. The author was sorry for what she did.

f. Jenna and the author promised to be lifelong friends.

A.f-a-b-c-e-d

B.a-c-f-b-d-e

C.a-b-c-f-e-d

D.f-a-c-b-d-e

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