题目内容

When he was in the countryside, he ______ visit the poor peasants.
[A] used to
[ B] was used to
[C]is used to
[D]had used to

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Joanne

[A] extension
[B] expansion
[C] effect
[D] extent

The story of the woman and her son supports the idea that________ .
[A] some things are better left unsaid
[B] honesty is fine for most of the time
[C] good intention leads to good results
[D] one should be encouraged to tell the truth

● 某计算机系统由下图所示的部件构成，假定每个部件的千小时可靠度都为R ，则该系统的千小时可靠度为（2）。
（2）

A. R + 2R / 4
B. R + R2/ 4
C. R(1 ？ (1？ R )2)
D. R(1 ？ (1？ R )2)2