皮皮学，免费搜题
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【单选题】
In Ms. Chen’s opinion, most of teachers are very responsible for their teaching. They prepared their lessons quite well. However, some of them, she guesses are good at research but ___________________.A.
not very good at singing
B.
not very good at talking
C.
not very good at dancing
D.
not very good at teaching
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皮皮学刷刷变学霸
举一反三
【简答题】A．Team spirit. B．Competition. C．Coordination. D．Problem-solving.
【单选题】关于肿瘤抗原，正确的是
A.
一种化学致癌物质在同一宿主诱导出的各部位的肿瘤的具有相同的抗原性
B.
一种致瘤病毒在同一宿主诱导出不同的肿瘤抗原
C.
结肠的癌胚抗原是由一种特定的病毒诱导的
D.
肿瘤抗原可能刺激B细胞和T细胞都产生免疫应答
E.
物理因素诱发的肿瘤特异性抗原所刺激的免疫应答，可抑制由相同的因素在其他部位诱发的肿瘤生长
【简答题】药物合成中常用的DMF,其CAS登录号为 。