[答案] C. comprehensive.
[注释] comprehensive 完全的无所不包的; comprehensible 能懂的, 可以理解的; understandable 可以理解的, 主要用来指人的行为。understanding 用来指人时, 表示"善于理解别人或别人问题的 (人) 。"注意下面的搭配：a comprehensive map (街区详图) ; a comprehensible remark (听得懂的话) ,an understandable mistake (可以理解的错误) ; an understanding friend (一位能理解人的朋友) 。
6. She was afraid that unless the train speeded up she would lose her _____ to Scotland.
A. ticket B. place C. seat D. connection
[答案] D. connection
[注释] lose one's connection to 误了到......地方去的 (汽车、火车、轮船的) 联运; The train was late and I missed my connection.
7. The ship was _____ in a storm off Jamaica.
A. drowned B. sunk C. wrecked D. submitted
[答案] C. wrecked
[注释] wreck vt. 撞坏, 毁坏; 1) My son wrecked my car. 2) My car was completely wrecked in the accident.
sink vt. 下沉, 沉没, 该动词也可作及物动词用, 意为“使下沉”, 但按本题句意看, 用被动语态不妥。 drown 溺死, 淹死： (vt.) He drowned his wife. (vi) He drowned in the river. (他在河里淹死了。) submit 1) (=put oneself under the control of another) 提交, 呈送 (to) ： Should a wife submit herself to her husband? (妻子应顺从他丈夫吗?) 2) (=put forward for option, discussion, decision ect.) 提出 (供评论、讨论决定等) You must submit your request to the committee. 3) (=surrender (to) , give in) 屈服,投降：After being defeated, they submitted to the enemy. (打败后, 他们向敌人投降了。)
8. No one has _____ been able to trace the author of the poem.
A. still B. yet C. already D. just
[答案] B. yet...