【判断题】生物多样性是所有生物种类、种内遗传变异和它们的生存环境所构成的生态系统的统一体。
【判断题】生物多样性是所有生物种类、种内遗传变异和它们生存环境的总称。( )
【判断题】流行性乙型脑炎是人畜共患的传染病。( )
【单选题】数控车床启动前,必须检查机床的(),观察是否正常,然后才能启动车床。
【判断题】对长度为14~21m静压桩,应以设计桩长为终压控制条件。
【单选题】What does the passage say about the newly approved soda tax in Philadelphia?
A.
It will change the lifestyle of many consumers.
B.
It may encourage other US cities to follow suit.
C.
It will cut soda consumption among low-income communities.
D.
It may influence the marketing strategies of the soda business.
【单选题】生物多样性是所有生物种类、种内遗传变异和它们的生存环境的总称,可分为遗传多样性、物种多样性和景观多样性。景观多样性又常被称为( )。
【单选题】()does the restaurant of your hotel close?
【单选题】What does the author say about present-day universities?
A.
They are effectively tackling real or imagined problems.
B.
They often fail to combine teaching with research.
C.
They are over-burdened with admi ni strative staff.
D.
They lack talent to fix their deepening problems.