单项选择题
This passage supports the belief that（）
A．exact reasons for migration are not known B．birds migrate because of changes in temperature C．the ancestral home of all birds was the tropics D．glaciers caused birds to migrate
单项选择题 The underlined part "the law is loaded against him" in the second paragraph is most likely to mean （）
单项选择题 Which of these statements is true（）
单项选择题 One of the obligations a bank has to a customer （）
