Questions 14 to 17 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. What is the main topic of this passage
A. Sir William Johnson’s role in colonial America.
B. The trade patterns of the Iroquois nation.
C. Sir William Johnson and the American Revolution.
D. The British-French conflicts in the 1700’s.
Question 26 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now listen to the news
A. Half of the American Workers have promised to buy a new plane for the Delta Airlines.
B. The workers of Delta Airlines have promised to help buy a new plane for their company.
C. Half of the workers of Delta Airlines have promised to pay half the money for a new plane.
D. Half of the workers of Delta Airlines, have bought a new plane for the company.
可致血管舒张，通透性增加的是（）。
A. 磷脂酶A2
B. 激肽释放酶
C. 弹性蛋白酶
D. 脂肪酶
E. 以上均可
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