单项选择题The new study conducted by Dr. Sacco and his colleagues is unique in that ______.
单项选择题The details of the private investigation show that the firm______.
单项选择题It can be inferred from the passage that Nairobi is______
单项选择题What is the proportion of giving birth to a triplet
单项选择题On the issue of who should be included in the DNB, the writer seems to suggest that______