题目

There are many old trees in our school, each ________ about 100 years ago. A. dates back to     B. dating from   C. dated back   D. which dated to 答案：B 解析: date from是不及物的，用现在分词，each dating from…相当于and each (tree) dates from…美国科学家发明了一种特殊的隐形物质，在空气中沿_________传播的光，射到该物质表面上时会顺着衣服“流走”，从而无法让光在其表面发生_________，让旁人看不到它。