问题 多项选择题

以下关于M270发动机的机构结构,描述正确的是?()

A.缸盖采用高强度铝合金制成

B.曲轴箱和油底壳均采用铸铁制造

C.正时链条直接驱动一副平衡轴

D.进排气侧都可以实现凸轮轴正时调节

E.曲轴通过驱动链条以驱动机油泵

答案

参考答案:A, D, E

阅读理解

Middle school students have far too much homework. They usually have to sit up three or four hours every night doing their homework. Now one school in my hometown has made a rule of limiting(限制)homework. The homework is limited to an hour a day and the students have no homework on the weekend. I think this is an excellent idea that will allow students to live better and healthier lives.

Less homework will give students more time to enjoy other pastimes(休闲活动).I have many books which I received as gifts from my parents and friends. They have been kept there on my shelf for several years! Because of homework, I will have not read a single one of them. With less homework, students will be freer to develop their interests in art, music and other hobbies.

More time free from homework will get our physical health better. Many students

like sports, but they have little time to play football, basketball, volleyball and so on. They hardly have time to have a trip or take part in any social activities. They must spend so much time solving math problems and doing grammar exercises. Besides, staying up late to finish their homework leaves many students exhausted in the morning. Not getting enough sleep is not only unpleasant; it also makes students more likely(有可能得)to get colds and other illnesses.

小题1: Which is the best title for the passage?

A.Students dislike homework

B.No use doing homework

C.Homework is good for study

D.Homework should be limited小题2: According to the passage, what is an effect of having a lot of homework?

A.Students have little time for their hobbies.

B.Students have to finish their homework.

C.Students are more active in class.

D.Students are good at their lessons.小题3: The author of the passage may be ________.

A.a teacher

B.a student

C.a parent

D.a doctor小题4: According to the passage, what makes students more likely to get colds?

A.No having time to exercise.

B.Not getting enough sleep.

C.Getting up early for school.

D.Reading too many books.

综合