通过溢出点的构造等高线所圈定的封闭区面积称为（）。
A.闭合度
B.含油面积
C.闭合面积
D.油田面积
参考答案：C
Tom as well as his friends ____ to visit our school soon after they arrive in Nanan.[ ]
A. is coming
B. are coming
C. will have come
D. has come
对光周期无严格要求，在相当大的光期范围内均可进行生殖生长的作物是（）。
A、小麦
B、水稻
C、大豆
D、荞麦
