题目内容

Five hundred critically-iii patients were investigated with the main purpose of ______.

A. observing how they reacted to the crisis of death
B. learning how to best help themselves and their families
C. finding out their attitude towards the approach of death
D. helping themselves and their families overcome the fear of death

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在计算机系统中采用总线结构，便于实现系统的积木化构造，同时可以______。

A. 提高数据传输速度
B. 提高数据传输量
C. 减少信息传输线的数量
D. 降低指令系统的复杂性

Yesterday we ______to climb mountains.

A. go
B. have gone
C. went

It ______in China.

A. make
B. made
C. is made

引起虾肉肌肉组织腐败变质的主要物质是( )。

A. 水分
B. 分解酶
C. 碳水化合物
D. 不饱和脂肪酸