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What is David Peakall

A. He is a farmer.
B. He is a scientist of physics.
C. He is a toxicologist.
D. He works at the University of Michigan.

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甲氨蝶呤不具有哪项( )。

A. 橙黄色结晶性粉末
B. 为二氢叶酸还原酶抑制药
C. 治疗实体瘤的首选药
D. 用于急性白血病毛膜上皮癌的治疗
E. 在强酸中不稳定，可水解

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The author feels that the number sense displayed by Genus Eumenus is ______.

A. more remarkable than that of a crow
B. less convincing an instance than that displayed by the crow
C. actually not an instance of what the author is discussing
D. restricted to the female of this species

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The crow was finally deceived because ______.

A. it was not afraid of her men in the tower
B. it did not have a number sense
C. it could not distinguish between four and five
D. it was evening and the crow was unable to count the hunters

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下列叙述中哪项是正确的( )。

A. 增强药物的脂溶性使活性增强
B. 减低药物的脂溶性使活性降低
C. 增强药物的水溶性使活性增强
D. 减低药物的水溶性使活性降低
E. 适当的脂溶性将有最佳的活性

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What is David Peakall

A. He is a farmer. B. He is a scientist of physics. C. He is a toxicologist. D. He works at the University of Michigan.

甲氨蝶呤不具有哪项( )。

The author feels that the number sense displayed by Genus Eumenus is ______.

The crow was finally deceived because ______.

下列叙述中哪项是正确的( )。

A. He is a farmer.
B. He is a scientist of physics.
C. He is a toxicologist.
D. He works at the University of Michigan.