Children get gifts ____ Christmas and ____ their birthdays.

A. on; on B. at; on C. in; in D. in; on

B 【解析】 句意：孩子們在圣誕節(jié)和生日時得到禮物�？疾榻樵~辨析題。in泛指一般意義的上午、下午或晚上以及月或年等較長的時間；on表示星期幾或某一特定的日期；at表示時間的某一點(diǎn)、某一時刻或年齡等。at Christmas在圣誕節(jié)，是固定搭配；their birthdays他們的生日，是特定時間，需用介詞on；根據(jù)句意語境，可知選B。
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科目：初中英語 來源：山東省臨沂市2018年中考試卷英語 題型：閱讀單選

(2018·山東臨沂)What was discovered by accident? The answer is penicillin (青霉素). It kills germs. By killing germs, it saves lives. Suppose you are sick. You go to a doctor. She examines you. She says you have a “staph” infection (葡萄球菌感染). She gives you some medicine. You take it. The medicine knocks out the staph. Soon you are well. Before penicillin, this would not happen. Staph was almost sure death.

Everyone wanted a medicine. Laboratories worked day and night. They grew the staph in small dishes. Then they tried to kill it. Nothing worked.

The laboratory dishes had covers on them. They kept things from falling into dishes. Molds (霉菌) were a big worry. They are always in the air. You can’t see them. They’re too small. There are thousands of different molds. Molds can make an experiment (實驗) fail. That’s why dishes are covered.

Dr. Alexander Fleming was working to kill the staph germ. He worked for years. One day he took a cover off a dish. He looked inside. There was a thick growth of staph germ. There was also some mold. Then he saw something strange. Where the mold was, there was no growth of staph. This is what Fleming probably thought. “By accident, I found a mold to kill the dreaded staph.”

This is how penicillin was found. But here’s the real miracle (奇跡). There are thousands of kinds of molds. But only one kind can kill staph. The mold must have fallen into the dish a few days before. The cover was probably off only a few seconds (秒). In those few seconds the right mold fell into the right dish. Another man might have thrown the dish away. But Fleming was very careful and smart. He understood what the mold did. How lucky the humans were!

根據(jù)短文內(nèi)容，選擇最佳答案

1.During the experiments to find a medicine for staph infections, ________.

A. the dishes were not covered

B. staph and mold were put together

C. mold was kept in small dishes

D. staph was grown in small dishes

2.The word “ dreaded” means “_______”.

A. famous B. scary

C. health D. endangered

3.The last paragraph suggests that _______.

A. accidents happen to everyone

B. the careful person does not have accidents

C. the careless person will miss valuable chances

D. luck is enough when doing scientific experiments

4.Most of this passage is written by ______.

A. telling an unusual story B. showing the results of experiments

C. offering some reasons D. giving some advice

5.This passage is mainly about ______.

A. medicine for a staph infection B. useful accidents

C. Dr. Fleming’s research D. discovering penicillin

1.D 2.B 3.C 4.B 5.D 【解析】 短文大意：本文介紹了青霉素在實驗室的意外發(fā)現(xiàn)以及主要用途。 1.題意：在尋找葡萄球菌感染的藥物的實驗中， 。考查細(xì)節(jié)理解題。A. the dishes were not covered盤子沒有被覆蓋。B. staph and mold were put together把葡萄球菌和霉菌放在一起。C. mol...

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Shang Yang was a politician of the Qin state. He was very wise and forward-thinking(有遠(yuǎn)見的). He worked out several reform plans for the state, including focusing on farming and giving rewards(獎賞) to soldiers who were successful during war.

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