单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. The substance released when tomatoes are cooked can help______.

A．reduce the risk of cancer in the digestive system
B．process food in the digestive system
C．protect against cancer of stomach
D．prevent problems in developing fetuses

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单项选择题

When did home-schooling begin in the U.S.

A．In 1852.
B．In the middle of the nineteenth century.
C．At the time the District of Columbia established.
D．At the time the country establishe

单项选择题

What was Clarence Birdseye surprised to learn

A．A fish could survive being frozen.
B．The fish were easier to catch in the winter.
C．Food can be kept frozen indefinitely.
D．Solutions that freeze slowly form large ice crystals.

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. The substance released when tomatoes are cooked can help______. 您的浏览器不支持 audio 元素。

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. The substance released when tomatoes are cooked can help______.