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请你阅读回答： 2003年5月的一天，有人从浏阳河里捞出一只全身金黄色的“金蛤蟆”，据专家证实它的身份是分布于非洲的“爪蟾”。它的偷渡引起了人们的广泛关注，物种入侵不可大意。外来物种的入侵曾使我国蒙受过巨大损失，例如：我国曾经从美国、古巴大规模引进牛蛙，由于牛蛙的寿命长，其食性广泛且食量大，从昆虫到其他小型无脊椎动物无所不吃，繁殖能力强，具有明显的竞争优势，很快泛滥成灾，危害了本地两栖类的生存和发展。 (1)造成牛蛙泛滥成灾的主要原因是什么？__________________。 (2)从生态系统的稳定性方面考虑，人类从不同区域引入新物种时应注意什么？___________________。
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【简答题】试简述补料分批培养的优点
【单选题】Before his death last year, Professor Talline decided that he _________ leave $100,000 to iris university.
A.
can
B.
would
C.
may
D.
shall
【简答题】Before his death, ______had gained a position as America s first systematic philosopher.
【单选题】一组晶面间距从大到小的顺序:2.02Å,1.43Å,1.17Å,1.01 Å,0.90 Å,0.83Å,0.76 Å......,用波长为λkα=1.94Å的铁靶照射时,产生衍射的晶面组有( )个。
A.
3
B.
4
C.
5
D.
6
【单选题】How does the ending of the story indicate the elevation of Harry?
A.
Before his death, he dreams of climbing the summit of Kilimanjaro in a helicopter
B.
Before his death, he is able to fight death many times over
C.
Before his death, he is reunited with the woman he loves
D.
Before his death, he is able to see his fellow man
【单选题】Attached to his ________ was a letter he had written to his wife just days before his death. [ ]
A.
will
B.
way
C.
hope
D.
idea
【简答题】Before his death last year, Professor Johnson decided that he ________ leave $ 2,000,000 to his university. A) can B) would C) may D) shall
【单选题】The case of his death is being ________ and will be found out before long. [ ]
A.
looked up
B.
looked for
C.
looked into
D.
looked on
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