~ Hi , Tim . May I introduce you to my brother John? ~ ______________.
A.
No, you can't .
B.
Hi ! Nice to meet you , John .
C.
I don't think so.
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【单选题】已知原子序数相连的 X 、 Y 、 Z 三种元素的最高价氧化物对应水化物的酸性由强到弱的顺序是: HZO 4 >H 2 YO 4 >H 3 XO 4 ,下列判断正确的是 ( ) 1 阴离子的还原性按 X 、 Y 、 Z 顺序减弱 2 单质的氧化性按 X 、 Y 、 Z 顺序增强 3 元素的原子半径按 X 、 Y 、 Z 顺序减小 4 气态氢化物的稳定性按 X 、 Y 、 Z 顺序减弱 A . 12...
【单选题】___________________. First of all, we need money to repair old roads and build new roads. We also need more to pay teachers' salaries and to pay for services such as trash collection. Finally, more ta...
【多选题】Which of the following statements about synthetic biology is correct?
A.
Synthetic biology is an interdisciplinary branch of biology and engineering. It combines disciplines from biotechnology, genetic engineering, molecular biology, molecular engineering, systems biology, biophysics, electrical engineering, computer engineering, control engineering, and evolutionary biology.
B.
It aims to the design and construction of novel artificial biological pathways, organisms or devices, or the redesign of existing natural biological systems for research, engineering and medical applications.
C.
It is an emerging discipline that uses engineering principles to design and assemble biological components, a new emerging scientific field where ICT, biotechnology and nanotechnology meet and strengthen each other, designing and constructing biological modules, biological systems, and biological machines or, redesign of existing biological systems for useful purposes.
D.
It is recently defined as the artificial design and engineering of biological systems and living organisms for purposes of improving applications for industry or biological research.
【多选题】Which of the following statements about reproductive biology are correct?
A.
Reproductive biology is a field of study that looks at the growth and medical issues associated with the different stages of reproductive development.
B.
Reproductive biology is the study of the biochemistry, physiology, endocrinology, cell biology, genetics and molecular biology of a wide range of biological processes involved in reproduction.
C.
These processes include gametogenesis and germ stem cell biology, fertilization, embryo development, implantation, pregnancy, sexual differentiation, and mechanisms by which the reproductive organs develop, differentiate, age and incur disease.
D.
Research in reproductive biology has broad applications in public health, medicine, and agriculture, including contraception, infertility, reproductive toxicology, animal science, and oncology.