关于TI-Ag错误的是（）。 A.产生抗体时不需要T协助 B.可产生免疫记忆 C.只

欲将下列物质中的杂质除去得到较纯净的物质，下表中的除杂方法正确的是（　　）

A．A

B．B

C．C

D．D

第一节语法填空（课文段落填空，共10小题，每小题1.5分，满分15分）

仔细阅读下面的短文，根据上下文填写适当的词语或使用括号中的词语的适当形式填空。                       

On this important feast day, people eat food in the shape___11__ skulls and cakes with“bones” on it. ……The Western holiday Halloween also had ___12__ origin in old __13__ (believe) about return of the spirits of the dead people. It is now a children’s festival, when they ___14___ dress up and go to their neighbours’ homes to ask for sweets. If the neighbours do not give any sweets, the children might play __15___ trick on them.

B

Wang Peng sat in his empty restaurant____16___（feel） very frustrated. It had been a very strange morning. Usually he got up ____17___and prepared his menu of Barbecued Mutton kebabs, roast pork , stir-fried vegetables and ___18___ (fry) rice. By now his restaurant ought to be full of people but not today. He thought of his foods cooked in __19___ (hot), finest oil and nothing could be better. Suddenly he saw his friend Lao Li coming to other place to eat, something must have happened If Lao Li was not coming to his restaurant ___20___ he always did.

________ surprised me most was ________.

A．That…that she spoke Japanese so well

B．What…how could she speak Japanese so well

C．What…that she spoke Japanese so well

D．That…why she could speak Japanese so well

目前，我国约有1/5的国土存在不同程度的水土流失，每年仅因此相当于吃掉了（）的GDP总量。

A.0.05

B.0.04

C.0.06

D.0.035

自觉接受（）的监督和（）的指导，是正确开展边防秘密力量工作的根本保证。

A、国务院

B、各级领导

C、党委

D、上级业务部门