施工现场油漆作业与焊接作业不可同时进行。
参考答案：对
It's high time that we students ______ even harder at our lessons as the national entrance examination is coming nearer.
A．work
B．will work
C．worked
D．have to work
对放疗中度敏感的恶性肿瘤为（）
A.骨肉瘤
B. * * 状瘤
C.鳞状细胞癌
D.恶性淋巴瘤
E.牙龈瘤
