用适当的介词填空。

1. It's very cold ______ winter in Nanjing.

2. The Chinese New Year usually comes ______ February.

3. The first class begins _______ eight o'clock in our school.

4. We often go to Hongshan Zoo _______ Saturday.

5. We celebrate National Day _______ October 1st.

根据中外合资经营企业法律制度的规定，下列关于合营企业注册资本的表述中，正确的是( )。

A．注册资本为合营企业各方认缴的出资额之和

B．注册资本为合营企业投资总额之和

C．注册资本为合营企业各方实缴的出资额之和

D．注册资本为合营企业各方第一期缴付的出资额之和