皮皮学，免费搜题
登录
搜题
【单选题】
Which of the sentences below best expresses the essential information in the highlighted sentence in the passage(Paragraph 2)? Incorrect choices change the meaning in important ways or leave out essential information.A.
Stability, a feature of the biological clock's period, depends on changeable factors such as temperature.
B.
A major feature of the biological clock is that its period does not change despite significant changes in the environment.
C.
A factor such as temperature is an important feature in the establishment of the biological clock's period.
D.
Biological activity is not strongly affected by changes in temperature.
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】关于证券投资组合的方差，以下描述中正确的是（ ）。
A.
投资组合的方差等于组合中各证券的方差的加权平均数。
B.
方差等于组合中各证券的方差的加权平均数。
C.
投资组合的方差与组合中各证券的方差和权重均有关。
D.
投资组合的方差与组合中各证券间的相关系数有关。
【单选题】To our great _____, she did not come as expected that day.
A.
disappointment
B.
notice
C.
combat
D.
conversation
【单选题】To our great ____________, she did not come as expected that day.
A.
disappointment
B.
reception
C.
notification
【单选题】To our great ____________, she did not come as expected that day.
A.
diasappointment
B.
reception
C.
notification
【简答题】To our great surprise, she willingly accepted the____ (invite).
【单选题】To our great( ), she did not come as expected that day.
A.
disappoints
B.
disappointments
C.
disappointment
相关题目：