所有的细菌和真菌都是生态系统中的分解者.______.

题型:解答题

问题:

所有的细菌和真菌都是生态系统中的分解者.______.

考点:人类对细菌和真菌的利用细菌和真菌在自然界中的作用
题型:解答题

运动负荷试验时,亚极量运动的目标心率是指().

A.200-年龄

B.190-年龄

C.180-年龄

D.(200-年龄)×75%

E.(220-年龄)×85%

题型:解答题

前不久红红班里从外校转来一名男生,由于过去他们是邻居比较熟悉,所以红红和他经常在一起复习功课。可是没有想到,班上有的同学竟然在背后议论他们在谈恋爱。其实他们之间只是平时交往的多了些,却被同学们误解,红红很苦恼。她应该[ ]

A.继续交往,注意分寸

B.和班里说她的同学吵架

C.不再和男生说话

D.拒绝异性同学的一切邀请

题型:解答题

写出下列反应的化学方程式:

(1)用盐酸除铁锈______

(2)红磷燃烧______

(3)铁棒插入氯化铜溶液中______

(4)加热高锰酸钾固体______

在实验室,某化学课外活动小组的同学利用天津碱厂的碱渣(含有熟石灰)制取少量烧碱______.

题型:解答题

对长度为n的线性表进行顺序查找,在最坏情况下需要比较的次数为( )。

A.125

B.n/2

C.n

D.n+1

题型:解答题

When I was looking for a Christmas present for my daughter in a toy store, a nicely dressed little girl, with some money in her little hand, was looking at some beautiful dolls. When she saw a doll she liked, she would ask her father if she had enough money. He usually said yes.
At the same time, a boy, with old and small clothes, was looking at some video games. He, too, had money in his hand, but it looked no more than five dollars. Each time he picked up one of the video games and looked at his father, he shook his head.
The little girl had chosen her doll, a very beautiful one. However, she noticed the boy and his father. She saw the boy give up a video game with disappointment and walk to another corner of the store.
The little girl put her doll back to the shelf and ran over to the video game. After she talked to her father, she paid for the video game and whispered(耳语) to the shop assistant.
So the boy got the video game that he wanted for free—he was told it was a prize from the store. He smiled happily, although he felt it was so incredible. The girl saw all this happen. She smiled, too.
When I walked out of the store to my car, I heard the father ask his daughter why she had done that. I would never forget their short talk. " Daddy, didn’t Grandma want me to buy something that would make me happy"
He said, "Of course, she did. "
"Well, I just did!" With that, the little girl started skipping towards their car happily.

The underlined word "incredible" most probably means "______" in Chinese.

A.难以置信的
B.令人兴奋的
C.感到绝望的
D.荒谬可笑的

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