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题目
Questions are based on the following passage.
Cocoa contains chemicals calledflavanols （黄烷醇 ） that may help reduce the risk of strokes and heart attacks by lowering blood pressure and improving the body"s use of insulin （胰岛素 ） .
Washington chocolate producer Steve Kumar said that is one reason dark chocolate is increasingly popular among his customers. "A lot of people are attracted by dark chocolate because they just decide they love it， and they also have been reading all about the health benefits of dark chocolate，" said Kumar.
But those benefits have not been confirmed by studies involving large numbers of people. Also， during the production of chocolate， a lot of flavanols are destroyed， while sugar and fats are added to contribute to flavor.
Scientists now want to learn the benefits of flavanols in their pure form.
They plan a four-year study of 18，000 adults， who will take pills of pure cocoa flavanols， in what is being called the largest test of its kind. Jo-Ann Manson， of the Brigham and Women"s Hospital in Boston， is the lead researcher. "This pill of cocoa flavanols will avoid having the calories and the sugar and the fat found in chocolate，" said Manson. The pills also won"t have any taste. Participants，divided in two groups， will take two identical pills a day. One group"s pills will contain flavanols， while the others will getplacebo （安慰剂 ） pills. "The amount of chocolate that it would take in order to have this amount of cocoa flavanols would be more than ten times the amount that people would ordinarily eat，" said Manson.
Whatever the outcome of the study， Kumar said he"s not worried about his business. "People like the experience of actually biting into a piece of chocolate，whatever their favorites are，" he said.
The flavanol benefits test is still in the early stage， so scientists are not sure when the participants will be handed their first chocolate pills.
What chemical in cocoa may do good to the heart according to the passage？ 查看材料
A.Fat.
B.Insulin.
C.Sugar.
D.Flavanols.
更多“Questions are based on the following passage. Cocoa contains chemicals calledflavanols （”相关的问题
第1题
Passage Two Questions 62 to 66 are based on the following passage.
第62题：
第3题
Questions 14～16 are based on the following passage. You now have 15 seconds to read Questions 14～16 .
第 14 题 Which of the following is covered in BCD International programs？
第4题
Questions 14 to 17 are based on the following passage. At the end o f the passage, you
will be given 20 seconds to answer the questions.
Now, listen to the passage.
How long does an interview usually last according to the speaker？
[A] Less than 40 minutes.
[B] From 40 to 70 minutes.
[C] At least 40 minutes.
[D] More than 70 minutes.
第5题
Now, listen to the passage.
Nowadays, most colleges and universities encourage students to
[A] criticize others.
[B] share professors beliefs.
[C] give their own ideas.
[D] change their own beliefs.
第6题
Now, listen. to the passage.
In 1847 most countries of the world were
[A] not yet using postage stamps.
[B] collecting valuable stamps.
[C] buying stamps from Mauritius.
[D] printing their own stamps.
第7题
Questions 7 to 10 are based on the following conversation.
第7题：
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