题目内容

A:I don’’t know why we listen to George B:______

A. Look at the window and you’ll see. The kids were playing ball and Tommy failed to catch it.
B. I’ll clean it.
C. I’ll call the repair man.
D. Can’t you find out

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The energy problem is not merely a short-term crisis. Geologists 【1】 that 80 percent of all the oil 【2】 in the US will be used 【3】 before the year 2000. We might even come to the end of our coal reserves, abundant as they are, before another century is over. Americans have been 【4】 this situation suddenly. Many unprepared even to recognize 【5】 , and most of us are unprepared to meet it. We are unprepared 【6】 our habits and traditions, and our national life 【7】 based on a history of material abundance. With about 6 percent of the world’’s 【8】 ,we in the US 【9】 nearly 50 percent of the world’’s energy resources. Such resources within the us 【10】 are still ample by any standards except our own.

A. sources
B. minerals
C. energy
D. reserves

Experiments in the photography of moving objects ______in both the United States and Europe well before 1990.

A. have been conducting
B. were conducting
C. had been conducted
D. are conducted

S2. To make much progress with them, how should a manager evaluate his subordinates __________________________________________________.

试述诉讼时效的中止和中断。