大家都知道，英语四级听力是对学生听力水平的综合考核，在四级听力考试中，考生需要飞速准确地理解并回答各种语音材料的能力。为培养学生对英语语音、语调的敏锐度，新东方在线推荐了“2024年6月英语四级听力考试真题原文甄选（4）”，一块儿学习吧。
2024年6月英语四级听力考试真题原文甄选（4）
News Item 004-脑部肿瘤治疗办法有所发展
Neurosurgeonshave been using lasersto treat brain cancer since 2009, but now they say the technique may also allow them to deliver chemotherapydrugs directly into the brain.
The key is getting past the protective blood-brain barrier, which does its job so well it also keeps out potentially lifesaving chemotherapy drugs.
Kathy Smith has ovariancancer that spread to her brain, a type of brain cancer called glioblastoma.
Doctors insert a tiny probe into the brain, directly to the cancer where it burns up the tumor from the inside out.
According to Washington University Neurosurgery Professor Eric Leuthardt, during the procedure it was discovered the therapy had an unintended effect on the blood-brain barrier.
“We are basically able to show that this blood-brain barrier is broken down for around four weeks after you do this laser therapy. So not only are you killing the tumor, you are actually opening up a window of opportunity to deliver various drugs and chemicals and therapies that could otherwise not get there.”
In Kathy’s case, a powerful, experimental chemotherapy drug called doxorubicin, which has been notoriously hard to get past the barrier was delivered directly into her brain.
“I think what’s interesting is that the blood-brain barrier is a two-way street, that by breaking it down you can get things into the brain, but also by breaking it down, now things can go from your brain out into your circulation, to your peripheralsystem, which includes your immune system.” And the immune system helps fight cancer.
以上是新东方在线我们带来的2024年6月英语四级听力考试真题原文甄选（4），期望考生们都能获得出色的成绩。
