问题 选择题

某免疫学研究人员将病毒q注入A组小鼠体内,其小鼠均死亡;而将同剂量的病毒q注入B组小鼠体内,其小鼠只在第1周发热,以后恢复健康。在死亡和恢复健康的两种小鼠的体细胞中均检测出具有活性的病毒。下列假设中不能够解释此现象的是[ ]

A.注入A组小鼠体内的病毒q有活性,而注入B组小鼠体内的病毒q没有活性

B.A组小鼠体内未产生病毒q的抗体,而B组小鼠体内产生了病毒q的抗体

C.A组小鼠缺乏免疫力,而B组小鼠具有正常的免疫力

D.A组小鼠的胸腺发育不全,而B组小鼠的胸腺发育正常

答案

答案:A

阅读理解

                                                          The first Man on the Moon

     July 20th, 1969 was an important day. Two Americans landed on the moon. Their names were Armstrong

and aldrin. They went there by spaceship. Its name was Apollo 11.

     Apollo 11 left Cape Kennedy on July 16th and went three hundred and eight-five thousand kilometers. It took

the two Americans three days to get there. On July 20th the spaceship landed in the Sea of Tranquility (宁静),

Armstrong first stepped onto the moon. The two men walked on the ground of the moon. They picked up some

stones and put them in the spaceship. They jumped up and down. They were tired after their moonwalk, so they

rested.

     On July 21st Apollo 11 left the moon and returned to Earth. Three days later, it came down in the Pacific

Ocean (太平洋), A ship took the men to America.

1. Apollo 11 was the name of _____. [ ]

A. an American

B. a machine

C. a spaceship

D. a country

2. In the second paragraph, "the Sea of Tranquility" means "_____". [ ]

A. the moon

B. the earth

C. the sun

D. the world

3. The word "stepped" in the sentence "Armstrong first stepped onto the moon" in the second paragraph means

    "_______". [ ]

A. ran

B. stopped

C. flew

D. walked

4. It's ______ kilometers from the earth to the moon. [ ]

A. 385

B. 3850

C. 38500

D. 385000

5. July 20th, 1969 was an important day because _____. [ ]

A. Apollo 11 landed on the moon.

B. a spaceship was made.

C. two Africans landed on the moon.

D. a ship took the two men to America.

单项选择题