Ⅲ類放射源為危險源。在沒有防護情況下，接觸這類源幾小時就可對人造成永久性損傷，接觸幾天至幾周也可致人死亡。
1、正確正確
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Itwas_____andshedidnotknowenoughtoanalyzeeachproblemproperly.
Thelongprisongallerieswerefulloflifeand________gravebustle.
Inourdepartment,everystudent_________after-schoolactivities.
—Youwerebraveenoughtoraiseobjectionsatthemeeting.
—Well,nowIregret________that.
She________everythingelseandconcentratedonthetaskbeforeher.
