单项选择题

What is gene therapy supposed to do to live up to its promise

A．Screen a baby for sex.
B．Remove undesirable attributes.
C．Implant genes.
D．Identify genetic disorder.
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单项选择题
The author thinks that the service of the bookshop assistant is needed ______.
A．as soon as you enter the shop
B．before you start your browsing
C．only when you have finished your browsing
D．after you have made your final decision
单项选择题
What does dust-jacket in the first paragraph probably mean
A．The title of a book.
B．A kind of cloth.
C．Book cover full of dust.
D．Protecting paper cover of a book.
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