e to endanger lives than to save them (Line -7-9).后面又提到：Last week the agency canceled its earlier approval , effectively banning the device.这两句话提供了这个问题的答案。因此，答案：
The new models of artificial hearts are expected_______.
A) to have a working life of 10 or 20 years
B) to be set fully in the patient’s chest
C) to be equipped with an external power source
D) to create a new passage for infection
本题是考核正确理解事实细节的能力。选项已的意思与文章中第二段第三句，即"Inventors are now working…in the patient’s chest．"的意思符合，因此选项B)是答案。
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