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砌体结构有何优缺点？主要适用于哪些场合？

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Which of the following statements about technology PGD is not true？（)

A. PGD ensures every baby it produces is free of potential cancers.
B. PGD first screens and picks out embryos having no genetic cancer genes.
C. PGD is an extra procedure to the normal in-vitro fertilization (IVF).
D. PGD then implants several healthy embryos into a mother’s womb.

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“十九畏”中狼毒畏什么？

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to be relevant to
to focus attention on
to carry on
to read through
to complain about
1.Realizing the serious power shortages this year, the Chinese government is __ finding a solution to this problem. 2.Job applicants are usually asked about what experience they have that the position they are applying for. 3.You’ll have an accident if you driving like that. 4.It pays to spend a couple of minutes just your essay before submitting it. 5.Janet often not feeling appreciated at work.

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在灌注过程中，导管的埋置深度宜控制在（）。

A. 3-7m
B. 1-5m
C. 2-6m
D. 4-8m

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