______ 1. But she was thinking how well she remembered that trick of his- the trick of __________ (interruption) her.

（ ）又称 Ames 试验，检测受试物诱发（ ）回复突变成野生型的能力。 A: 鼠伤寒沙门氏菌组氨酸营养缺陷型突变株(his-) B: 鼠伤寒大肠杆菌组氨酸营养缺陷型突变株(his-) C: 鼠伤寒大肠杆菌回复突变试验 D: 鼠伤寒沙门氏菌回复突变试验

（ ）又称Ames试验，检测受试物诱发（ ）回复突变成野生型的能力。试验菌株都有组氨酸突变(his-)，不能自行合成组氨酸，在不含组氨酸的最低营养平皿上不能生长，回复突变成野生型后能自行合成组氨酸，可在最低营养平皿上生长成可见菌落。 A: A. 鼠伤寒志贺氏菌组氨酸营养缺陷型突变株(his-) B: B. 鼠伤寒大肠杆菌组氨酸营养缺陷型突变株(his-) C: C. 鼠伤寒沙门氏菌组氨酸营养缺陷型突变株 D: D. 鼠伤寒沙门氏菌回复突变试验

Isthis_______bike?No.________isoverthere. A: his,Him B: his,His C: him,His D: his,He’s

在接近中性pH条件下，即可为氢离子受体，也可为氢离子供体的基团是（） A: His-咪唑基 B: Cys-巯基 C: Lys-ε-氨基 D: Arg-胍基

He left the room, _________.( ) A: his nose bled, his hands shake B: . his nose bled, his hands shaking C: his nose bleeding, his hands shake D: his nose bleeding, his hands shaking

He had a shop of his own. It was ______ shop. A: his own B: his's C: his' own D: his'

His face looks like . A: his father B: that of his father C: the same as his father's D: one of his father

Who advised Joe to give up his studies? A: His girlfriend. B: His mother. C: His cousin. D: His teacher.

The boy is Tony. This is ____ jacket. ____ is yellow. A: her; it B: his; it C: her; his D: his; his