此题为判断题(对,错)。
第1题:
He is talking so much about America as if he ____ there.
A、had been
B、has been
C、was
D、been
第2题:
This text mainly discusses( )
[A] reasons to abolish the practice of tipping
[B] economic sense of tipping
[C]consumers' attitudes towards tipping
[D]tipping for good service

第3题:
真核生物ITS序列由ITS1和ITS2两部分组成。
第4题:
[A] employed
[B] appointed
[C] interviewed
[D] questioned
第5题:
2、家族性帕金森病-PD1型的分子病理是因为 基因突变所致。
A.PARK1
B.PARK2
C.PARK3
D.PARK4
第6题:
家族性帕金森病-PD1型的分子病理是因为 基因突变所致。
A.PARK1
B.PARK2
C.PARK3
D.PARK4