求租英语完形填空正确答案

求租英语完形填空正确答案
Scientists issued reports on the severe climate changes that could result __21__ the “greenhouse effect”—the gradual __22__ of the atmosphere caused by an increase in carbon dioxide __23__ from the burning of fossil fuels,saying that __24__ global temperatures could start to rise within a few decades and reach levels nine degrees Fahrenheit higher than today’s temperatures by the end of the next century.This,experts said,could create dangerous changes to global weather __25__.For instance,it could change annual amounts of rainfall,swell or dry up rivers,and __26__ the level of the seas.
While _27__ that this forecast was somewhat uncertain,scientists warned __28__ treating it as a cry of wolf.Although there is __29__ debate over how severe the greenhouse effect will be,one thing seems certain:Carbon dioxide levels are __30__ the rise.
21.A.about B.of C.in D.from
22.A.cooling B.warming C.hotting D.freezing
23.A.level B.degree C.extent D.range
24.A.common B.usual C.average D.ordinary
25.A.style B.type C.pattern D.form
26.A.rise B.arise C.arouse D.raise
27.A.admitting B.admitted C.having admitting D.being admitted
28.A.against B.about C.of D.for
29.A.considerate B.considering C.considerable D.considered
30.A.of B.for C.in D.on

我自己答了啊
21 D
22 B
23 A
24 C
25 C
26 D
27 A
28 A
29 A
30 D