小题1:It is our d________ (责任，义务) to try to cut back on production and reduce the amount of things we make and buy.

小题2:Trees a________ (吸收) the carbon dioxide in the air to produce oxygen.

小题3:People have harmed nature through a________ (农业), fishing, hunting and tourism.

小题4:Many countries have hesitated to give p________ (准许，许可) for the production of GM foods, as they would rather be cautious with this new technology.

小题5:I feel really g________ (内疚的) because I made some cruel remarks too.

表示最多可达1GB二进制数据的数据类型是（）。

A.文本类型

B.OLE类型

C.是/否类型

D.自动编号类型