谁能帮我做一篇英语阅读?

谁能帮我做一篇英语阅读?
Imagine reading one day that you had been a subject in a risky science experiment without knowing it.At school,you had been fed cereal laced with radioactive chemicals,so scientists could learn more about the digestive system.Because the food was radioactive,scientists could easily trace its path through the body.
Scientists now know that exposure to large amounts of radiation can cause cancer,a group of diseases in which bodily cells grow wildly out of control.Some people who were part of the radiation studies later developed cancer and blame the radiation for causing the cancer.Others are worried the radiation will some day make them sick.
Some doctors say that,in many cases,such fears are unjustified because the radiation doses used in the experiments were too small to cause harm.They also say that since the dangers of radiation were less well-understood then than they are now,even researchers who used high doses of radiation didn't do anything wrong.
Some critics claim that no excuse is acceptable for not informing subjects about the nature of an experiment and giving them a chance to refuse to participate.Today,government rules require such informed agreement whenever a study uses people.
1.The passage is mainly about ______ .
A) whether it is moral to experiment on people without their knowing it
A) what kinds of experiment cannot be done on people
B) how radiation studies are conducted in a secret way
D) what result can be produced in a radioactive experiment
2.The word "laced" in paragraph 1 most probably means ______ .
A) surrounded B) mixed C) covered D) confused
3.Which of the following is true according to the passage?
A) Radioactive chemicals were once used to cure diseases with the digestive system.
B) When the danger of radiation had not been proved,high doses of radiation were acceptable.
C) Most cancers are caused by radiation.
D) Radioactive chemicals can cause bodily cells to grow wildly out of control.
4.Today,government rules ______ .
A) prohibit all tests related to human beings
B) disapprove of experiments with uncertain results
C) demand to protect people's right to refuse to be tested
D) demand to stop all experiments harmful to people
5.The author's attitude towards the government's decision may be described as
A) favorable B) critical C) dubious D) indifferent