[单选题] We decided to leave the waitress a big _____ because her service was excellent.

1、[单选题]He is the only child in the family.He has __sisters __brothcrs.

• A、ncithe... nor
• B、eithe.... or
• C、both. ... and
• D、ncither... or

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2、[单选题]Even if English is so widely used in the world, by no mcans______our mother tongue.

• A、it can replacc
• B、will it replace
• C、it will replace
• D、it replaces

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3、[单选题]Edgar ______ in doing it, though he had failed more than once.

• A、persisted
• B、insisted
• C、assisted
• D、resisted

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4、[阅读理解]【阅读理解】According to some doctors，_____
A. ncithcr cxpressing nor repressing ansger would produce hormoncs
B. cxpressing anger would produce lower level of hormones than repressing it
c. cxpressing angcr would produce the same levcl of hormones as repressing it
D. expressing angcr would nroducc hishcr level of hormones than repressing it

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5、[阅读理解]【阅读理解】 What concern do critics have about genetic engineering?c
A. More labor force is needed.
B. Complex machines are required.
c. The impact of mixed genes is still unknown.
D. lt is costly to use genetic engineering in farming.

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