【单选题】幼儿经常滥发脾气、哭闹,并且胆小恐惧,具有社交方面的焦虑,属于()。
【单选题】The influenza pandemic of 1918 to 1919 ______.
A.
was the only large-scale epidemic in modern times
B.
killed about one third of the world's population
C.
had a great impact on the world economy
D.
killed more people than AIDS did
【单选题】 已知一个 U S =20V 的理想电压源与一个 R =4 Ω 的电阻并联,则这个并联电路的等效电路可用 ( ) 表示 。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
B.
IS=5A的理想电流源与R=4Ω的电阻并联。
D.
IS=5A的理想电流源与R=4Ω的电阻串联。
【单选题】The best title for the passage is______.
A.
Dangerous Sports: What and Why
B.
Boredom of Modern Life
C.
Bungee Jumping: Is It Really Dangerous?
【单选题】Stress is a word commonly found in today's vocabulary, and is often used to describe modern working and living patterns, especially in big cities. Yet stress has been a part of daily life since time i...
【单选题】( )不会影响指示剂变色范围的是( )。
【单选题】下列关于婴儿营养素需要的说法正确的是()。
D.
除钙、铁、锌、碘外,牛乳和母乳喂养的婴儿不易缺乏其他矿物质
E.
母乳喂养的婴儿易缺乏维生素D,因此需要多晒太阳