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问题 单项选择题

化脓性骨髓炎是涉及什么组织的化脓性感染（）

A.骨髓

B.骨皮质和骨髓

C.骨膜和骨髓

D.骨膜、骨皮质和骨髓

E.骨皮质和骨膜

答案

参考答案：D

解析：化脓性骨髓炎是一种常见病，病因为化脓性细菌感染，涉及骨膜、松质骨、皮质骨与骨髓组织。

完形填空

第二节：语法填空（共10小题；每小题1.5分, 满分15分）

If you walked past the supermarket, you would find many foods that have been treated ____16______ (kill) any harmful germs that might have been in them. Milk is a good example. Raw milk --- that is, milk just as it comes from the cow --- may be _____17_____    (safe) to drink. But ____18______ the milk is heated and then cooled, the harmful germs are killed. The man ____19______discovered this way of treating milk was a Frenchman by the name of Louis Pasteur.

In the supermarket you would also find many frozen foods --- frozen fruits, vegetables, meat and fish. As techniques for ____20______ (freeze) food are being improved, more frozen foods are appearing on the market, and more people are buying them. Fruits and vegetables to be sold in the supermarket are often frozen the moment ____21______are picked. The       ____22_____(soon) fruits and vegetables are frozen, the better. _______23_____, machines are often taken into the fields where____24______food grows, so that little time is lost _____25_____picking and freezing.
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多项选择题

下列检测器中利用外光电效应的有（）。

A.光电管

B.光敏电阻

C.光敏二极管

D.光电池

E.光电倍增管
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