(单选题)48: She could not hide her ______. ( ) A: amusement B: moment C: disappoint D: disappointment ...

(单选题)42: It is a （worthwhile） experiment even it may fail. ( ) A: necessary B: completely C: valuable D: perfect ...

(单选题)36: Identify the errors in the following sentence:John said his mother would buy him a five-speeds racing bicycle for his sixteenth birthday. ( ) A: would buy him B: five-speeds C: for D: sixteenth birthday ...

(单选题)30: Identify the errors in the following sentence:Although the town has been attacked by the storm several times, few damages was done. ( ) A: attacked B: by C: few damages D: done ...

(单选题)24: ______ this road until you get to the church; then turn left. () A: Keep B: Change C: Follow D: Lead ...

(单选题)18: Identify the errors in the following sentence:Jim spent his vacation going to Mexico, flying to Hawaii and he visited Canada. ( ) A: spent B: his vacation C: flying to Hawaii D: he visited Canada ...

(单选题)12: You must make ______ of any opportunities you have of practicing oral English. ( ) A: means B: use C: sense D: usage ...

(单选题)6: To the citizens of the United States, the bald eagle symbolizes strength ______ freedom. ( ) A: as well as B: or C: also D: both ...

(单选题)100: 合成RNA的原料之一是??( ) A: AMP B: ATP C: dAMP D: dATP E: GDP ...

(单选题)94: 能切断和连接DNA链的酶是??( ) A: DNA聚合酶 B: 光解酶 C: 解旋酶 D: 连接酶 E: 拓扑酶 ...