缺乏下列哪种T细胞,则B细胞不能产生抗体或产生低水平的抗体() A.辅助性T细胞 B

题型:单项选择题

问题:

缺乏下列哪种T细胞,则B细胞不能产生抗体或产生低水平的抗体()

A.辅助性T细胞

B.抑制性T细胞

C.杀伤T细胞

D.细胞毒性T细胞

E.调节T细胞

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题型:单项选择题

One evening Charlie was on his way home from the railway station. When he turned round a corner, he heard footsteps behind him and he thought someone was coming near. He began to walk fast. The footsteps came fast, too. He slowed down. The footsteps also slowed down. Now he was sure that someone must be going after him. He tried to hide. Still the steps followed him. He didn't know how to save himself, so he jumped over some tall grass and hid himself in a cemetery(墓地). He threw himself down on one of tombs(坟墓).

The man behind came near. Charlie could hear the man jump over the grass. Thoughts of thieves and robbers filled his mind. Charlie stood up and faced the man. "What do you want? Why are you coming after me?" He asked.

"I say," the stranger asked, "do you always go home like this, or are you taking some special exercise tonight? I want to go to Mr. Green's and don't know the way. The station master told me to follow you as you live next door. Excuse me for asking, but is there much farther to go before we get there?"

小题1: That day Charlie was ____.

A.leaving the station for a cemetery

B.walking slowly along the street

C.on his way to Mr. Green's house

D.on his way back home小题2:When he found someone following him, Charlie ____.

A.was too frightened to move

B.stopped to ask the man why

C.hid himself in a cemetery

D.knew clearly what to do小题3: Charlie went into a cemetery because he ____.

A.tried to get rid of the stranger

B.got tired after a day's walk

C.walked too fast and lost

D.wanted to hide his things there小题4:When the stranger followed him into the cemetery, Charlie thought ____.

A.the stranger would ask him the way

B.the stranger would come to stay with him

C.he was in danger of losing his money or even his life

D.he could be asked about Mr. Green小题5: The stranger followed Charlie because ____.

A.he wanted to kill Charlie.

B.he wanted to steal things.

C.he wanted to go to Charlie's place.

D.he wanted to go to Mr. Green's and he didn't know the way there.

题型:单项选择题

下列解释过程或事实的方程式不正确的是 [ ]

A.熔融烧碱时,不能使用普通石英坩埚:SiO2+2NaOHNa2SiO3+H2O

B.在海带灰的浸出液(含有I-)中滴加H2O2得到I2:2I- + H2O2 + 2H+ == I2 + O2↑+ 2H2O

C.红热的铁丝与水接触,表面形成蓝黑色(或黑色)保护层: 3Fe + 4H2OFe3O4 + 4H2

D.“84消毒液”(有效成分NaClO)和“洁厕灵”(主要成分盐酸)混合使用放出氯气:

ClO-+Cl-+2H+== Cl2↑+H2O

题型:单项选择题

英译汉:"advance shipment;charter;endorse",正确的翻译为()

A.背书;提前装船;包租(船)

B.提前装船;包租(船);背书

C.包租(船);背书;提前装船

D.提前装船;背书;包租(船)

题型:单项选择题

物质由_____组成。

题型:单项选择题

下列()是还原剂。

A、Na2CO3

B、抗坏血酸

C、KIO4

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