题目内容：
请在第__(58)__处填上正确答案。
A．how B．if
C．which
D．since
参考答案：
答案解析：
单选题：请在第__(58)__处填上正确答案。
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B．if
C．which
D．since
B．if
C．which
D．since
Paragraph②______
Paragraph②______A．Main Results of Recent Researches B．Difference between Genetic
There were eighteen people on board the Matthew during its v
There were eighteen people on board the Matthew during its voyage to North Ameri
请在第__49__处填上正确答案。
请在第__49__处填上正确答案。
Countries that ratify the FCTC will have to, among other thi
Countries that ratify the FCTC will have to, among other things, __________A．hav
Paragraph 4__________
Paragraph 4__________A．What the FCTC Demands B．US Signing of the FCTC C．Oppositi