根据所掌握的文化或背景知识，选择正确答案。

小题1:What does the word “weekdays” mean?

A．周末

B．周末以外的几天

C．星期日

D．周小题2:Americans speak _____.

A．Chinese

B．French

C．English

D．Japanese小题3:The time 7:30 in English isn’t _____.

A．seven thirty

B．thirty past seven

C．twenty to eight

D．half past seven小题4:I walk to school every day. _____?

A．How are you

B．How about you

C．How old are you

D．What are you小题5:If you can paint, you can join the_____.

A．music club

B．sports club

C．English club

D．art club小题6:Three quarters of an hour mean _____.

A．fifteen minutes

B．thirty minutes

C．twenty minutes

D．forty-five minutes

现有下列基本粒子：¹H、²H、³H、¹H^＋、²³⁴U、²³⁵U、238U、⁴⁰K、⁴⁰Ca、Cl₂、¹⁴N、¹⁴C，请回答下列问题：

(1)其中，它们分属________种元素，属于氢元素的核素有________种，属于铀元素的核素有________种。互为同位素的原子分别为________，________。

(2)质量数相等的粒子为________，________(可不填满，也可补充)。