【单选题】In the author's opinion, we should thank a dream because ____________
A.
it makes us enjoy a different life
B.
we can avoid terrible things in real life
C.
we can experience various emotions in dreams
D.
it can help us regain the innocent moments of life
【判断题】一个力偶就是两个方向相反、大小相等且不在同一直线上的力。
【判断题】一个力偶就是两个方向相反、大小相等、方向平行且不在同一直线上的力。
【单选题】We have received your letter of September 12, ______ we are glad to know that you are interested in our electric heaters.