水利水电工程施工中常用的土石分级，依（）等，土分为4级，岩石分为12级。

Directions:

Thissectionistotestyourabilitytocomprehendshortpassages.Youwillheararecordedpassage.Afterthatyouwillhearfivequestions.Boththepassageandthequestionswillbereadtwotimes.Whenyouhearaquestion,youshouldcompletetheanswertoitwithawordorashortmphrase(innomorethan3words).Thequestionsandincompleteanswersareprintedinyourtestpaper.YoushouldwriteyouranswersontheAnswerSheetcorrespondingly.

16、Whatproductdoesthecompanyproduce?______.

17、Whenwasthecompanysetup?______ago.

18、Wherearetheirproductssold?Both______andabroad.

19、Accordingtothespeaker,whydotheirproductshaveagoodreputation?

Becauseofthehighqualityandgood______theyprovide.

20、Whatdoesthespeakerpromisetogiveforalargeorder?A______.

截流日期应选择在()。

粉状或颗粒状材料在某堆积体积内，颗粒之间的空隙体积所占的比例称为材料的()。

失事后将造成下游灾害严重影响工程效益的建筑物称为（）。