问题 选择题

下列关于油脂的叙述中,不正确的是                                   

A.油脂没有固定的熔点和沸点,油脂是混合物

B.天然油脂大多是由混甘油酯分子构成的混合物

C.油脂的主要成分是高级脂肪酸的甘油酯,是酯的一种

D.油脂的水解叫皂化反应

答案

答案:D

油脂分为油和脂肪,为高级脂肪酸的甘油酯。油脂在碱性条件下的水解叫做皂化反应。

阅读理解

Do you know star anise? It has a Chinese name “bajiao”(八角). You can find this spice(调味料) in almost all Chinese kitchens. Suddenly people around the world need the small fruit from which the spice is made, because of bird flu(禽流感).

Bird flu has made tens of millions of birds die and killed at least 60 people in Asia. Scientists say if flu changes to spread from person to person, it could kill millions!

A medicine called Tamiflu(达菲) is supposed to fight bird flu in humans. Roche, a Swiss company, developed it. But Roche says it hasn’t enough raw material(原料) to make lots of Tamiflu. The material is the Chinese spice star anise.

About 90% of the world’s star anise is produced in South China. The fruit is harvested(丰收) between March and May. Besides spice, people also use it as medicine.

People afraid of bird flu have begun to buy star anise and cook chicken and other meat with it more. But so far, no scientists say the spice could give protection(保护). Some scientists say that eating the fruit itself won’t help against bird flu.

小题1:Most world’s star anise is produced in          .

A.Swiss

B.Africa

C.Asia

D.South China小题2:According to the passage, the underlined word “supposed” probably means          .

A.thought

B.should

C.felt

D.ought小题3:Star anise is harvested           .

A.for one month

B.for half a year

C.for almost three months

D.All year round小题4:What’s the main idea of this passage?

A.The introduction of star anise.

B.The influence of bird flu.

C.The introduction of Tamiflu.

D.Star anise is used to make medicine to help fight bird flu.小题5:Which one is NOT right according to the passage?

A.Star anise is a kind of spice.

B.Most star anise is produced in China.

C.Bird flu is dangerous for people.

D.Scientists say spice can help against bird flu.

单项选择题