题目

由单克隆抗体研制而成的“生物导弹”由两部分组成，一是“瞄准装置”，二是杀伤性“弹头”，下列对此叙述不正确的是( ) A．“瞄准装置”是指识别肿瘤的单克隆抗体 B．“弹头”由放射性同位素、化学药物等物质构成 C．“弹头”具有选择性杀伤肿瘤细胞的功能 D．“生物导弹”的制备利用了细胞工程技术  听力理解 听下面两篇材料，从A，B，C中选出最佳选项。 听第一篇材料，回答第1，2，3题。 1．What do they eat for lunch and for supper? [　　] A．A green salad for lunch and some beefsteak for supper. B．Some bread and potatoes for lunch, and some meat for supper. C．Some meat for lunch and a green salad for supper. 2．How much meat do they want to buy? [　　] A．About twenty pounds. B．About two pounds. C．About three pounds. 3．What food shall they buy? [　　] A．A green salad and some potatoes. B．Potatoes and beefsteak. C．A green salad, some beefsteak and potatoes. 听第二篇材料，回答第4，5，6题 4．What is the distance between the earth and the moon? [　　] A．380,000 kilometers. B．165,000 kilometers. C．385,000 kilometers. 5．What did they do on the moon? [　　] A．They tied some equipment to the rock there. B．They put up a tent there for rest. C．They brought back some rocks from the moon. 6．In which part of the moon did the astronauts land? [　　] A．On top of a mountain. B．In the Sea of Tranquility. C．By the side of Cape Kennedy.