2. 外语
  3. Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century ad

Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century ad

admin2013-04-25  42
问题 Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century advances in techniques of genetic research.
选项 A、which
B、whereas
C、such as
D、is also
答案C
解析
转载请注明原文地址:https://kaotiyun.com/show/USyO777K
0

托福（TOEFL）

相关试题推荐
随机试题
最新回复(0)