图形显示速度是影响Windows运行效率的重要方面。

German scientists say that eating a little chocolate every day may keep you away from cardiovascular(心血管的) disease. The scientists have found that chocolate, especially dark chocolate , can help you cut down 39 percent of heart disease, including taking a very small amount . However, the study advises people not to eat too much chocolate, because too much chocolate is bad for our bodies. So the scientists advise people to eat small amount of chocolate instead of sugar or high-fat snacks.

Scientists said, “Dark chocolate shows the greatest effects, milk chocolate fewer , and white chocolate no effects.” The results showed chocolate may cut down blood pressure, but they also say that further study is needed.

In the eight-year study, people’s daily diet, exercise habits, and blood pressure were studied in 19,357 persons aged 35 to 65. They found that people who are an average of 7.5 grams of chocolate a day had a very lower chance of heart disease than those who ate much less chocolate , and average of 1.7 grams a day.

小题1:It took the scientists __________ years to prove that small amount of chocolate is good for people.

A．8

B．35

C．39

D．65小题2:In the study, scientists studied _______________.

A．where chocolate came from

B．how chocolate was made

C．people’s daily diet, exercise habit and blood pressure

D．why people liked chocolate so much小题3:From the passage, we know that _________________.

A．chocolate was popular in Germany before

B．chocolate is good for us, but we should not eat too much

C．eating 1.7 grams of chocolate each time is the best

D．people aged 35 had better not eat chocolate

正式沟通的缺点包括（）。

A.改善人际关系

B.易于保密

C.内容广泛

D.不够灵活

E.真实性欠佳

束草诱杀可防治哪些害虫？应在何时束草？

硬导体材料一般可用铝合金，则使用铜材的情况是( )。

A．位于市K

B．化工厂附近

C．工作电流在3000A以下

D．地震多发区

收益率曲线（）的机会最多。

A.向上倾斜

B.向下倾斜

C.水平

D.隆起