The power of the female heart remains undiminished between the ages of 18 and 70 probably because _________. A: women almost lose no contractile muscle cells in the walls of their hearts B: women's oestrogen has a protective effect on their heart C: the size of their heart chambers is different from men's D: the thickness of the female heart's muscular wall is different from men's

Twitter is a free microblogging service founded in 2006. At its heart are ______-character bursts of information called tweets. Users can include ________ to other content in their tweets, and broadcasts can be public or private.

在手边 未知类型：{'label': 'questionDesc', 'content': '请为以下词组选择适合的英文表达。', 'isMemberControl': 0, 'type': 181} A: on the spot B: in one's heart C: on hand

Women tend to mistake signs of heart attacks for symptoms of stress. 未知类型：{'label': 'questionDesc', 'content': '以下哪个选项[color=#ff3853]不可以作为[/color]题干的定位词？', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2021年12月 四级 卷一 信息匹配 There’s a stress gap between men and women', 'isMemberControl': 0, 'type': 181} A: mistake signs B: heart attacks C: stress

He __________ in the children's games. A: generous B: envious C: content D: frustrated