【单选题】Why can't you see light when you look at a black hole?
A.
Because most black holes are so far away.
B.
Because the gravity of a black hole is so strong that it sucks? the light inward.
C.
Because as the star's gases burn, it stops giving off heat and light.
D.
Because as a star cools, its outer layers pull in toward its center.
【单选题】—Look,the light in Jim’s room is still on. Do you know______? —To study for the coming exam, maybe.
C.
why he stays up so late
D.
when he will stop working
【单选题】How many reasons for the Brazil's changing families?
【单选题】You look light-hearted. Nothing seems ______ to you.
【单选题】在句子“A light heart lives long.”中,主语部分是:
【单选题】19世纪( )设计的演变,对于研究技术革新与设计的关系很有意义。
【简答题】How many reasons does the writer list to thank competition?
【简答题】You look
light-hearted. Nothing seems _____ to you.A. to happen B. to have been happened C. to have
happened D. to be happened
【简答题】How many reasons the integrated approach was well receive by the students?
【单选题】光缆干线按每 多少 个信息插座配 2 芯光纤。()