路面结构层次的次序为（）。
A、面层、联结层、垫层
B、面层、基层、整平层
C、面层、联结层、基层、垫层
D、面层、联结层、垫层、基层
参考答案：C
患者女，76岁。心脏查体心浊音界变小。该患者可能是（）
A.胸腔积液
B.大量腹水
C.肺实变
D.胸膜粘连
E.肺气肿
Research has been limited to ____ production profits, rather than ____ that GM foods are safe.
A．increasing; make sure
B．increasing; making sure
C．increase; make sure
D．increase; making sure
