一般情况下，在普通电阻率测井底部梯度曲线上，高阻层底面为（），顶面为（）。

— _____________ is it from China to Canada?

— About 8,500 kilometres.[ ]

A. How old

B. How many

C. How much

D. How far

读句子，注意画线的词语，说说这样写的好处，再简要写下来。

1．几场春雨过后，到那里走走，常常会看见许多鲜嫩的笋，成群地从土里探出头来。

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2．月明人静的夜里，它们便唱起歌来：“织，织，织，织呀！织，织，织，织  呀！”

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要除去密闭容器中的氧气而不带入其它杂质，应选用下列物质中的是

A．铁丝

B．木炭

C．石蜡

D．磷

Although custom prosthetic bone replacements produced through a new computer-aided design process will cost more than twice as much as ordinary replacements, custom replacements should still be cost-effective. Not only will surgery and recovery time be reduced, but custom replacements should last longer, thereby reducing the need for further hospital stays.
Which of the following must be studied in order to evaluate the argument presented above

A．The amount of time a patient spends in surgery versus the amount of time spent recovering from surgery.

B．The amount by which the cost of producing custom replacements has declined with the introduction of the new technique for producing them.

C．The degree to which the use of custom replacements is likely to reduce the need for repeat surgery when compared with the use of ordinary replacements.

D．The degree to which custom replacements produced with the new technique are more carefully manufactured than are ordinary replacements.

E．(E) The amount by which custom replacements produced with the new technique will drop in cost as the production procedures become standardized and applicable on a larger scale.

设int a[10]，*p=a；，数组元素a[4]的正确引用是( )

A．*(p+4)

B．p+4

C．*p+4

D．a+4