21¡¢    killing of unarmed citizens in the Gaze Strip left people in       anger around the Arabic world.

A.The ;a             B./;a            C.The;/              D.A;a

22.Things came____ after that£®And now he has____ student in Hong Kong University.

A.easy£»become       B.easy£»turned   C.easily£»become     D.easily£»turned

23£®Carl Linnaeus, the famous botanical scientist, was a man always in blue. His depression was       his childhood illness in his biography.

    A£®centered on                                             B£®concentrated on

    C£®named after                                             D£®referred to