关于视神经盘的描述错误的是（）。 A.位于眼球后极的内侧 B.位于黄斑的内侧 C.为

— Is Tom still smoking?

— No. By next Saturday he ＿＿ for a whole month without smoking a single cigarette.

A．will go

B．will have gone

C．will have been

D．has been going

大事记是按照时间顺序简要记述一定范围内发生的重大事件、重要活动的一种档案参考资料。

Part two: language Knowledge

Section A (15 points)

Directions: Beneath each of the following sentences there are 4 choices marked A, B, C and D. Choose the one answer that best completes the sentence.

21. --- Time passes quickly, doesn’t it?

--- Yes. It will be only two months_______we take the 2010 College Entrance Examination.

A．since B．after  C．before      D．When

正态分布函数的标准偏差越大，表示随机变量在（）附近出现的密度越小。

A.总体平均值

B.样本平均值

C.总体中位数

D.样本中位数

BM500-02漏电探测仪检测棒可以检测直流电电线漏电。