题目内容

• The older a person gets, the less (8) he can recall. 8. ____

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• Memory loss can also be caused by (9) 9. ____

V. Understanding the process of memory will give people(10) about solving the problem of forgetfulness. 10. ____

Part I — Paras. 1-2By using Winston Churchill’s story and his speech at Harrow as an introduction to the topic, the text makes clear its statement: the secret of success is “”.Part II — Paras. 3-7Through the examples of world famous scientists, statesman, and jurist, the text brings forward the statement that only those with a , those who “keep their eyes on the prize”, and those who _______ to keep going, will finally succeed.Part III — Paras. 8By reinforcing the statement given in part II, the text draws the conclusion that with hard work, _, dedication and preparation, you can _ any handicap, accomplish any feat, and __________.

单片机晶振频率为12MHz，则其机器周期为，指令周期最多可为。

A. 1ms4ms
B. 1us3us
C. 1us4us
D. 2us6us