23. The aim of voyages Maury encouraged in the 1840s was __________.
A) to make some sound experiments in the oceans
B) to collect samples of sea plants and animals
C) to estimate the length of cable that was to be made
D) to measure the depths of two oceans
23. A primary nurse can propose a different approach of treatment when _______.
A) the present one is refused by the patient
B) the patient complains about the present one
C) the present one proves to be ineffective
D) the patient is found unwilling to cooperate
注:第三段第二句
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