Questions 14-23 ·Look at the ten statemen
题型：单项选择题
问题：
Questions 14-23
·Look at the ten statements for this part.
·You will hear a passage about "the number of genes ". You will listen to it twice.
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·Markyour answers on the Answer Sheet.
The two competing teams of scientists had quite different ideas about the number of human genes.
A．Right
B．Wrong
C．Not Mentioned
为一残冠，根面位于龈上，X线显示已行完善的根管治疗，如何处理残冠（）