我国城镇企业职工基本养老保险的基金筹集原则为（）、略有结余、（）。
参考答案：以支定收；留有部分积累
—You don't look well today, Jenny. What's the matter with you?
—My grandmother is ill. I am _____ her health. [ ]
A. interested in
B. surprised at
C. worried about
D. pleased with
我国国家标准GB904-91通用商品条码的结构与EAN条码结构相同，由（）位数字码以及对应的条码组成。
A.10
B.12
C.13
D.15
