单选题
A8%(中低收入国家)；15%(高收入国家)
B11.5%(中低收入国家)；23.5%(高收入国家)
C8%(中低收入国家)；12%(高收入国家)
D14%(中低收入国家)；32%(高收入国家)
E7%(中低收入国家)；25%(高收入国家)
正确答案
答案解析
略
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