题干

下列关于用转基因动物作器官移植供体的研究的叙述,不正确的是

A:器官短缺和免疫排斥是目前制约人体器官移植的两大难题

B:猪的内脏构造、大小和血管分布与人的相似

C:灵长目动物体内隐藏的、可导致人类疾病的病毒少于猪

D:无论以哪种动物作为供体,都需要在其基因组中导入某种调节因子以抑制抗原决定基因的表达,或设法除去抗原决定基因

上一题 下一题 0.0难度 选择题 更新时间:2014-06-30 06:47:11

答案(点此获取答案解析)

C

同类题5

   The teacher stood before his class and was going to hand out the final exam papers. “I know how 1you have all worked to prepare for this test,” he said. “And because I know you can do it well, I am willing to offer a B to anyone who would 2 not to take the test.
Many students jumped up to 3 the teacher and left the classroom. The teacher looked at the 4 students and said, “Does anyone else want to get a B? This is your last 5.” Two more students decided to go.
   Seven students remained. The teacher then handed out the 6. There were only three sentences typed on the paper: Congratulations! You have just 7 an A in this class. Keep believing in yourself.
   I never had a teacher like that, but I think it is a test 8 any teacher could and should give. Students who are not 9 in what they have learned are B students at best(充其量).
   The same is 10 in real life. The A students are those who believe in what they are doing because they have 11 both successes and failures. They have learned life’s lessons, either from normal education 12 from events in their lives, and have become 13 people.
    Scientists say that by the age of eight, 80% of what we believe about ourselves has already been formed. You are a big kid now, and you 14 that you have some limits (限制). However, there is 15 you can't do or learn or be. Sir Edmund Hillary, the first person to reach the summit of Mount Everest said, “It’s not the mountain we conquer(克服) but ourselves.