单选题 Research ______ all over the world into the cure for cancer in the past few years.

A、 was made

B、 had been made

C、 is making

D、 has been made

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相关试题

单选题 Which of the following is true about the Great Wall?

A、The Great Wall was wholly formed in Spring and Autumn Dynasty.

B、Its length is around ten thousand li.

C、The width of its top can hold ten men to walk side by side.

D、It is a place where true man born.

单选题 What does jiaozi symbolize?

A、Happiness.

B、Health.

C、Wealth.

D、Love.

单选题 Why do people choose to eat jiaozi on New Year's Eve?

A、They want to keep warm.

B、They hope to have a good future in the coming new year.

C、They hope to keep away from illness.

D、They hope to become wealthy.

单选题 How long was the Great Wall of China in fact?

A、Ten thousand li.

B、More than 6,000 kilometers long

C、The distance from west to east.

D、Twenty centuries.

单选题 When did Chinese people probably begin to have jiaozi?

A、It dates back to the Tang Dynasty.

B、It dates back to the Ming Dynasty.

C、It appeared only in recent years.

D、It dates back to ancient times.

单选题 When the enemy invaded, what did the soldiers do on the watchtowers?

A、The horses and men walked side by side on the watchtowers.

B、They kept watch on the watchtowers.

C、Soldiers lit fires as a warning.

D、Soldiers hid in the watchtowers.

单选题 How was the Great Wall built?

A、By Hand and Modern Machines.

B、Of stone and earth.

C、Of the flesh and blood of million men.

D、By hand.

单选题 When was the Great Wall joined up?

A、The Spring and Autumn Period.

B、The Warring States Period.

C、The Qin Dynasty.

D、Twenty centuries ago.