27.The train when I rushed to the station to see my uncle off, so we didn’t talk much that evening.
A.has left B.had left C.left D.was leaving
26.Sales fell by 19% last year, but that didn’t stop the company form being the largest in the province for the 8 th year .
A.as a result B.in a row
C.one after another D.in the first place
25.You should have the car by a mechanic before you buy it. After all, it is second – hand.
A.repaired B.painted C.inspected D.driven
24. , you should set aside some time every day for exercise if you want to keep fit.
A.Busy as you are B.As busy are you
C.Busy as are you D.As busy you are
23.The soldier fired to warn the man forward.
A.to go B.going C.go D.against going
22.He failed to set new record, but it was good attempt.
A.a; a B.the; the C.a; the D./; /
第一节:语法和词汇知识(共15小题;每小题1分,满分15分)
21.--- You must have had a good time at the party last night, didn’t you?
--- . Actually, it was a bit boring.
A.Oh, great B.I suppose so C.Not really D.That’s OK
47.(6分)在两种免疫的方式中:体液免疫是靠B淋巴细胞产生的游离于体液中的抗体实现的免疫,如接种牛痘所表现出的对天花病毒的免疫;另一种细胞免疫,它不产生游离的抗体,而是依靠另一种淋巴细胞--T淋巴细胞有直接冲击和破坏外来细胞的免疫,如器官移植免疫。下面是有关这两种免疫方式的相关实验。将切除胸腺的小鼠用大剂量X射线照射后,进行如下实验。实验过程和结果如下表:
实验 |
输入胸腺淋巴细胞 |
输入骨髓淋巴细胞 |
免疫反应 |
|
细胞免疫 |
体液免疫 |
|||
实验一 |
× |
× |
- |
- |
实验二 |
√ |
× |
+ |
- |
实验三 |
× |
√ |
- |
+ |
实验四 |
√ |
√ |
+ |
+ |
(1)根据上述实验,你能得出哪些结论?请分析说明。
(2)若要保证器官移植(如肾移植、骨髓移植)手术的成功,选择合适的供体非常关键,请举例说明,现代哪些生命科学技术的发展和应用为寻求合适的供体提供了更为广阔的渠道。
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