GRE陈虎平阅读36套-04-智课网.pdf

智课网GRE 备考资料 Exercise 4 It is a popular misconception that nuclear fusion 1. It can be inferred from the passage that the power is free of radioactivity; in fact, the deuterium- author believes which of the following about the tritium reaction that nuclear scientists are currently current state of public awareness concerning Line exploring with such zeal produces both alpha particles nuclear fusion power? 5 and neutrons. (The neutrons are used to produce tritium (A) The public has been deliberately misinformed from a lithium blanket surrounding the reactor.) about the advantages and disadvantages of Another common misconception is that nuclear fusion nuclear fusion power. power is a virtually unlimited source of energy because (B) The public is unaware of the principal of the enormous quantity of deuterium in the sea. advantage of nuclear fusion over nuclear 10 Actually, its limits are set by the amount of available fission as an energy source. lithium, which is about as plentiful as uranium in the (C) The public‘s awareness of the scientific Earth‘s crust. Research should certainly continue on facts concerning nuclear fusion power is controlled nuclear fusion, but no energy program somewhat distorted and incomplete. should be premised on its existence until it has proven (D) The public is not interested in increasing its 15 practical. (122 words) awareness of the advantages and disadvantages of nuclear fusion power.